diff --git a/school/hooks.py b/school/hooks.py
index e3b2b351..73365a81 100644
--- a/school/hooks.py
+++ b/school/hooks.py
@@ -141,6 +141,12 @@ website_route_rules = [
 	{"from_route": "/courses/<course>/learn/<int:chapter>.<int:lesson>", "to_route": "batch/learn"},
 	{"from_route": "/courses/<course>/progress", "to_route": "batch/progress"},
 	{"from_route": "/courses/<course>/join", "to_route": "batch/join"},
+	{"from_route": "/courses/<course>/manage", "to_route": "cohorts"},
+	{"from_route": "/courses/<course>/cohorts/<cohort>", "to_route": "cohorts/cohort"},
+	{"from_route": "/courses/<course>/cohorts/<cohort>/<page>", "to_route": "cohorts/cohort"},
+	{"from_route": "/courses/<course>/subgroups/<cohort>/<subgroup>", "to_route": "cohorts/subgroup"},
+	{"from_route": "/courses/<course>/subgroups/<cohort>/<subgroup>/<page>", "to_route": "cohorts/subgroup"},
+	{"from_route": "/courses/<course>/join/<cohort>/<subgroup>/<invite_code>", "to_route": "cohorts/join"},
 	{"from_route": "/users", "to_route": "profiles/profile"}
 ]
 
diff --git a/school/lms/api.py b/school/lms/api.py
index b60d2d13..f6aee823 100644
--- a/school/lms/api.py
+++ b/school/lms/api.py
@@ -45,3 +45,119 @@ def save_current_lesson(course_name, lesson_name):
     doc.current_lesson = lesson_name
     doc.save(ignore_permissions=True)
     return {"current_lesson": doc.current_lesson}
+
+
+@frappe.whitelist()
+def join_cohort(course, cohort, subgroup, invite_code):
+    """Creates a Cohort Join Request for given user.
+    """
+    course_doc = frappe.get_doc("LMS Course", course)
+    cohort_doc = course_doc and course_doc.get_cohort(cohort)
+    subgroup_doc = cohort_doc and cohort_doc.get_subgroup(subgroup)
+
+    if not subgroup_doc or subgroup_doc.invite_code != invite_code:
+        return {
+            "ok": False,
+            "error": "Invalid join link"
+        }
+
+    data = {
+        "doctype": "Cohort Join Request",
+        "cohort": cohort_doc.name,
+        "subgroup": subgroup_doc.name,
+        "email": frappe.session.user,
+        "status": "Pending"
+    }
+    # Don't insert duplicate records
+    if frappe.db.exists(data):
+        return {"ok": True, "status": "record found"}
+    else:
+        doc = frappe.get_doc(data)
+        doc.insert(ignore_permissions=True)
+        return {"ok": True, "status": "record created"}
+
+@frappe.whitelist()
+def approve_cohort_join_request(join_request):
+    r = frappe.get_doc("Cohort Join Request", join_request)
+    sg = r and frappe.get_doc("Cohort Subgroup", r.subgroup)
+    if not sg or r.status not in ["Pending", "Accepted"]:
+        return {
+            "ok": False,
+            "error": "Invalid Join Request"
+        }
+    if not sg.is_manager(frappe.session.user) and "System Manager" not in frappe.get_roles():
+        return {
+            "ok": False,
+            "error": "Permission Deined"
+        }
+
+    r.status = "Accepted"
+    r.save(ignore_permissions=True)
+    return {"ok": True}
+
+@frappe.whitelist()
+def reject_cohort_join_request(join_request):
+    r = frappe.get_doc("Cohort Join Request", join_request)
+    sg = r and frappe.get_doc("Cohort Subgroup", r.subgroup)
+    if not sg or r.status not in ["Pending", "Rejected"]:
+        return {
+            "ok": False,
+            "error": "Invalid Join Request"
+        }
+    if not sg.is_manager(frappe.session.user) and "System Manager" not in frappe.get_roles():
+        return {
+            "ok": False,
+            "error": "Permission Deined"
+        }
+
+    r.status = "Rejected"
+    r.save(ignore_permissions=True)
+    return {"ok": True}
+
+
+@frappe.whitelist()
+def undo_reject_cohort_join_request(join_request):
+    r = frappe.get_doc("Cohort Join Request", join_request)
+    sg = r and frappe.get_doc("Cohort Subgroup", r.subgroup)
+    # keeping Pending as well to consider the case of duplicate requests
+    if not sg or r.status not in ["Pending", "Rejected"]:
+        return {
+            "ok": False,
+            "error": "Invalid Join Request"
+        }
+    if not sg.is_manager(frappe.session.user) and "System Manager" not in frappe.get_roles():
+        return {
+            "ok": False,
+            "error": "Permission Deined"
+        }
+
+    r.status = "Pending"
+    r.save(ignore_permissions=True)
+    return {"ok": True}
+
+@frappe.whitelist()
+def add_mentor_to_subgroup(subgroup, email):
+    try:
+        sg = frappe.get_doc("Cohort Subgroup", subgroup)
+    except frappe.DoesNotExistError:
+        return {
+            "ok": False,
+            "error": f"Invalid subgroup: {subgroup}"
+        }
+
+    if not sg.get_cohort().is_admin(frappe.session.user) and "System Manager" not in frappe.get_roles():
+        return {
+            "ok": False,
+            "error": "Permission Deined"
+        }
+
+    try:
+        user = frappe.get_doc("User", email)
+    except frappe.DoesNotExistError:
+        return {
+            "ok": False,
+            "error": f"Invalid user: {email}"
+        }
+
+    sg.add_mentor(email)
+    return {"ok": True}
diff --git a/school/lms/doctype/cohort/__init__.py b/school/lms/doctype/cohort/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort/cohort.js b/school/lms/doctype/cohort/cohort.js
new file mode 100644
index 00000000..002b8b3c
--- /dev/null
+++ b/school/lms/doctype/cohort/cohort.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, FOSS United and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Cohort', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/cohort/cohort.json b/school/lms/doctype/cohort/cohort.json
new file mode 100644
index 00000000..2efa1428
--- /dev/null
+++ b/school/lms/doctype/cohort/cohort.json
@@ -0,0 +1,131 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "autoname": "format:{course}/{slug}",
+ "creation": "2021-11-19 11:45:31.016097",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "course",
+  "title",
+  "slug",
+  "section_break_2",
+  "instructor",
+  "status",
+  "column_break_4",
+  "begin_date",
+  "end_date",
+  "duration",
+  "section_break_8",
+  "description",
+  "pages"
+ ],
+ "fields": [
+  {
+   "fieldname": "description",
+   "fieldtype": "Markdown Editor",
+   "label": "Description"
+  },
+  {
+   "fieldname": "instructor",
+   "fieldtype": "Link",
+   "label": "Instructor",
+   "options": "User",
+   "reqd": 1
+  },
+  {
+   "fieldname": "status",
+   "fieldtype": "Select",
+   "label": "Status",
+   "options": "Upcoming\nLive\nCompleted\nCancelled",
+   "reqd": 1
+  },
+  {
+   "fieldname": "begin_date",
+   "fieldtype": "Date",
+   "label": "Begin Date"
+  },
+  {
+   "fieldname": "end_date",
+   "fieldtype": "Date",
+   "label": "End Date"
+  },
+  {
+   "fieldname": "duration",
+   "fieldtype": "Data",
+   "label": "Duration"
+  },
+  {
+   "fieldname": "slug",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Slug",
+   "unique": 1
+  },
+  {
+   "fieldname": "column_break_4",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "section_break_8",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "section_break_2",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "title",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Title",
+   "reqd": 1
+  },
+  {
+   "fieldname": "course",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Course",
+   "options": "LMS Course",
+   "reqd": 1
+  },
+  {
+   "fieldname": "pages",
+   "fieldtype": "Table",
+   "label": "Pages",
+   "options": "Cohort Web Page"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [
+  {
+   "group": "Links",
+   "link_doctype": "Cohort Subgroup",
+   "link_fieldname": "cohort"
+  }
+ ],
+ "modified": "2021-12-16 14:44:25.406301",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort",
+ "naming_rule": "Expression",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort/cohort.py b/school/lms/doctype/cohort/cohort.py
new file mode 100644
index 00000000..429baac5
--- /dev/null
+++ b/school/lms/doctype/cohort/cohort.py
@@ -0,0 +1,85 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.model.document import Document
+
+class Cohort(Document):
+    def get_url(self):
+        return f"{frappe.utils.get_url()}/courses/{self.course}/cohorts/{self.slug}"
+
+    def get_subgroups(self, include_counts=False, sort_by=None):
+        names = frappe.get_all("Cohort Subgroup", filters={"cohort": self.name}, pluck="name")
+        subgroups = [frappe.get_cached_doc("Cohort Subgroup", name) for name in names]
+        subgroups = sorted(subgroups, key=lambda sg: sg.title)
+
+        if include_counts:
+            mentors = self._get_subgroup_counts("Cohort Mentor")
+            students = self._get_subgroup_counts("LMS Batch Membership")
+            join_requests = self._get_subgroup_counts("Cohort Join Request", status="Pending")
+            for s in subgroups:
+                s.num_mentors = mentors.get(s.name, 0)
+                s.num_students = students.get(s.name, 0)
+                s.num_join_requests = join_requests.get(s.name, 0)
+
+        if sort_by:
+            subgroups.sort(key=lambda sg: getattr(sg, sort_by), reverse=True)
+        return subgroups
+
+    def _get_subgroup_counts(self, doctype, **kw):
+        rows = frappe.get_all(doctype,
+            filters={"cohort": self.name, **kw},
+            fields=['subgroup', 'count(*) as count'],
+            group_by='subgroup')
+        return {row['subgroup']: row['count'] for row in rows}
+
+    def _get_count(self, doctype, **kw):
+        filters = {"cohort": self.name, **kw}
+        return frappe.db.count(doctype, filters=filters)
+
+    def get_page_template(self, slug, scope=None):
+        p = self.get_page(slug, scope=scope)
+        return p and p.get_template_html()
+
+    def get_page(self, slug, scope=None):
+        for p in self.pages:
+            if p.slug == slug and scope in [p.scope, None]:
+                return p
+
+    def get_pages(self, scope=None):
+        return [p for p in self.pages if scope in [p.scope, None]]
+
+    def get_stats(self):
+        return {
+            "subgroups": self._get_count("Cohort Subgroup"),
+            "mentors": self._get_count("Cohort Mentor"),
+            "students": self._get_count("LMS Batch Membership"),
+            "join_requests": self._get_count("Cohort Join Request", status="Pending"),
+        }
+
+    def get_subgroup(self, slug):
+        q = dict(cohort=self.name, slug=slug)
+        name = frappe.db.get_value("Cohort Subgroup", q, "name")
+        return name and frappe.get_doc("Cohort Subgroup", name)
+
+    def get_mentor(self, email):
+        q = dict(cohort=self.name, email=email)
+        name = frappe.db.get_value("Cohort Mentor", q, "name")
+        return name and frappe.get_doc("Cohort Mentor", name)
+
+    def is_mentor(self, email):
+        q = {
+            "doctype": "Cohort Mentor",
+            "cohort": self.name,
+            "email": email
+        }
+        return frappe.db.exists(q)
+
+    def is_admin(self, email):
+        q = {
+            "doctype": "Cohort Staff",
+            "cohort": self.name,
+            "email": email,
+            "role": "Admin"
+        }
+        return frappe.db.exists(q)
diff --git a/school/lms/doctype/cohort/test_cohort.py b/school/lms/doctype/cohort/test_cohort.py
new file mode 100644
index 00000000..a7cf10ba
--- /dev/null
+++ b/school/lms/doctype/cohort/test_cohort.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCohort(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/cohort_join_request/__init__.py b/school/lms/doctype/cohort_join_request/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort_join_request/cohort_join_request.js b/school/lms/doctype/cohort_join_request/cohort_join_request.js
new file mode 100644
index 00000000..8f6cec18
--- /dev/null
+++ b/school/lms/doctype/cohort_join_request/cohort_join_request.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, FOSS United and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Cohort Join Request', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/cohort_join_request/cohort_join_request.json b/school/lms/doctype/cohort_join_request/cohort_join_request.json
new file mode 100644
index 00000000..8ecd4be3
--- /dev/null
+++ b/school/lms/doctype/cohort_join_request/cohort_join_request.json
@@ -0,0 +1,76 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2021-11-19 16:27:41.716509",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "cohort",
+  "email",
+  "column_break_3",
+  "subgroup",
+  "status"
+ ],
+ "fields": [
+  {
+   "fieldname": "cohort",
+   "fieldtype": "Link",
+   "label": "Cohort",
+   "options": "Cohort",
+   "reqd": 1
+  },
+  {
+   "fieldname": "subgroup",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Subgroup",
+   "options": "Cohort Subgroup",
+   "reqd": 1
+  },
+  {
+   "fieldname": "email",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "E-Mail",
+   "options": "User",
+   "reqd": 1
+  },
+  {
+   "default": "Pending",
+   "fieldname": "status",
+   "fieldtype": "Select",
+   "in_list_view": 1,
+   "label": "Status",
+   "options": "Pending\nAccepted\nRejected"
+  },
+  {
+   "fieldname": "column_break_3",
+   "fieldtype": "Column Break"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2021-12-16 15:06:03.985221",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort Join Request",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort_join_request/cohort_join_request.py b/school/lms/doctype/cohort_join_request/cohort_join_request.py
new file mode 100644
index 00000000..95c975f8
--- /dev/null
+++ b/school/lms/doctype/cohort_join_request/cohort_join_request.py
@@ -0,0 +1,51 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.model.document import Document
+
+class CohortJoinRequest(Document):
+    def on_update(self):
+        if self.status == "Accepted":
+            self.ensure_student()
+
+    def ensure_student(self):
+        # case 1 - user is already a member
+        q = {
+            "doctype": "LMS Batch Membership",
+            "cohort": self.cohort,
+            "subgroup": self.subgroup,
+            "member": self.email,
+            "member_type": "Student"
+        }
+        if frappe.db.exists(q):
+            return
+
+        # case 2 - user has signed up for this course, possibly not this cohort
+        cohort = frappe.get_doc("Cohort", self.cohort)
+
+        q = {
+            "doctype": "LMS Batch Membership",
+            "course": cohort.course,
+            "member": self.email,
+            "member_type": "Student"
+        }
+        name = frappe.db.exists(q)
+        if name:
+            doc = frappe.get_doc("LMS Batch Membership", name)
+            doc.cohort = self.cohort
+            doc.subgroup = self.subgroup
+            doc.save(ignore_permissions=True)
+        else:
+            # case 3 - user has not signed up for this course yet
+            data = {
+                "doctype": "LMS Batch Membership",
+                "course": cohort.course,
+                "cohort": self.cohort,
+                "subgroup": self.subgroup,
+                "member": self.email,
+                "member_type": "Student",
+                "role": "Member"
+            }
+            doc = frappe.get_doc(data)
+            doc.insert(ignore_permissions=True)
diff --git a/school/lms/doctype/cohort_join_request/test_cohort_join_request.py b/school/lms/doctype/cohort_join_request/test_cohort_join_request.py
new file mode 100644
index 00000000..dd386401
--- /dev/null
+++ b/school/lms/doctype/cohort_join_request/test_cohort_join_request.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCohortJoinRequest(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/cohort_mentor/__init__.py b/school/lms/doctype/cohort_mentor/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort_mentor/cohort_mentor.js b/school/lms/doctype/cohort_mentor/cohort_mentor.js
new file mode 100644
index 00000000..81f90950
--- /dev/null
+++ b/school/lms/doctype/cohort_mentor/cohort_mentor.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, FOSS United and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Cohort Mentor', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/cohort_mentor/cohort_mentor.json b/school/lms/doctype/cohort_mentor/cohort_mentor.json
new file mode 100644
index 00000000..42aade7a
--- /dev/null
+++ b/school/lms/doctype/cohort_mentor/cohort_mentor.json
@@ -0,0 +1,73 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2021-11-19 15:31:47.129156",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "cohort",
+  "email",
+  "subgroup",
+  "course"
+ ],
+ "fields": [
+  {
+   "fieldname": "cohort",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "in_standard_filter": 1,
+   "label": "Cohort",
+   "options": "Cohort",
+   "reqd": 1
+  },
+  {
+   "fieldname": "email",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "E-mail",
+   "options": "User",
+   "reqd": 1
+  },
+  {
+   "fieldname": "subgroup",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Primary Subgroup",
+   "options": "Cohort Subgroup",
+   "reqd": 1
+  },
+  {
+   "fetch_from": "cohort.course",
+   "fieldname": "course",
+   "fieldtype": "Link",
+   "label": "Course",
+   "options": "LMS Course",
+   "read_only": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2021-11-29 16:32:33.235281",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort Mentor",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort_mentor/cohort_mentor.py b/school/lms/doctype/cohort_mentor/cohort_mentor.py
new file mode 100644
index 00000000..71bf9c4b
--- /dev/null
+++ b/school/lms/doctype/cohort_mentor/cohort_mentor.py
@@ -0,0 +1,12 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.model.document import Document
+
+class CohortMentor(Document):
+    def get_subgroup(self):
+        return frappe.get_doc("Cohort Subgroup", self.subgroup)
+
+    def get_user(self):
+        return frappe.get_doc("User", self.email)
diff --git a/school/lms/doctype/cohort_mentor/test_cohort_mentor.py b/school/lms/doctype/cohort_mentor/test_cohort_mentor.py
new file mode 100644
index 00000000..06be484e
--- /dev/null
+++ b/school/lms/doctype/cohort_mentor/test_cohort_mentor.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCohortMentor(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/cohort_staff/__init__.py b/school/lms/doctype/cohort_staff/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort_staff/cohort_staff.js b/school/lms/doctype/cohort_staff/cohort_staff.js
new file mode 100644
index 00000000..8deaab23
--- /dev/null
+++ b/school/lms/doctype/cohort_staff/cohort_staff.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, FOSS United and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Cohort Staff', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/cohort_staff/cohort_staff.json b/school/lms/doctype/cohort_staff/cohort_staff.json
new file mode 100644
index 00000000..dca4e0f9
--- /dev/null
+++ b/school/lms/doctype/cohort_staff/cohort_staff.json
@@ -0,0 +1,77 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2021-11-19 15:35:00.551949",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "cohort",
+  "course",
+  "column_break_3",
+  "email",
+  "role"
+ ],
+ "fields": [
+  {
+   "fieldname": "cohort",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Cohort",
+   "options": "Cohort",
+   "reqd": 1
+  },
+  {
+   "fieldname": "email",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "User",
+   "options": "User",
+   "reqd": 1
+  },
+  {
+   "fieldname": "role",
+   "fieldtype": "Select",
+   "in_list_view": 1,
+   "label": "Role",
+   "options": "Admin\nManager\nStaff",
+   "reqd": 1
+  },
+  {
+   "fetch_from": "cohort.course",
+   "fieldname": "course",
+   "fieldtype": "Link",
+   "label": "Course",
+   "options": "LMS Course",
+   "read_only": 1
+  },
+  {
+   "fieldname": "column_break_3",
+   "fieldtype": "Column Break"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2021-12-16 15:16:04.042372",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort Staff",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort_staff/cohort_staff.py b/school/lms/doctype/cohort_staff/cohort_staff.py
new file mode 100644
index 00000000..6febbcc4
--- /dev/null
+++ b/school/lms/doctype/cohort_staff/cohort_staff.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class CohortStaff(Document):
+	pass
diff --git a/school/lms/doctype/cohort_staff/test_cohort_staff.py b/school/lms/doctype/cohort_staff/test_cohort_staff.py
new file mode 100644
index 00000000..c27f423e
--- /dev/null
+++ b/school/lms/doctype/cohort_staff/test_cohort_staff.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCohortStaff(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/cohort_subgroup/__init__.py b/school/lms/doctype/cohort_subgroup/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort_subgroup/cohort_subgroup.js b/school/lms/doctype/cohort_subgroup/cohort_subgroup.js
new file mode 100644
index 00000000..9c851cf0
--- /dev/null
+++ b/school/lms/doctype/cohort_subgroup/cohort_subgroup.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, FOSS United and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Cohort Subgroup', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/cohort_subgroup/cohort_subgroup.json b/school/lms/doctype/cohort_subgroup/cohort_subgroup.json
new file mode 100644
index 00000000..06bc00ab
--- /dev/null
+++ b/school/lms/doctype/cohort_subgroup/cohort_subgroup.json
@@ -0,0 +1,104 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "autoname": "format:{title} ({cohort})",
+ "creation": "2021-11-19 11:50:27.312434",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "cohort",
+  "slug",
+  "title",
+  "column_break_4",
+  "invite_code",
+  "course",
+  "section_break_7",
+  "description"
+ ],
+ "fields": [
+  {
+   "fieldname": "cohort",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "in_preview": 1,
+   "in_standard_filter": 1,
+   "label": "Cohort",
+   "options": "Cohort",
+   "reqd": 1
+  },
+  {
+   "fieldname": "title",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "in_preview": 1,
+   "in_standard_filter": 1,
+   "label": "Title",
+   "reqd": 1
+  },
+  {
+   "fieldname": "description",
+   "fieldtype": "Markdown Editor",
+   "label": "Description"
+  },
+  {
+   "fieldname": "invite_code",
+   "fieldtype": "Data",
+   "label": "Invite Code",
+   "read_only": 1
+  },
+  {
+   "fieldname": "slug",
+   "fieldtype": "Data",
+   "label": "Slug",
+   "reqd": 1
+  },
+  {
+   "fetch_from": "cohort.course",
+   "fieldname": "course",
+   "fieldtype": "Link",
+   "label": "Course",
+   "options": "LMS Course",
+   "read_only": 1
+  },
+  {
+   "fieldname": "column_break_4",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "section_break_7",
+   "fieldtype": "Section Break"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [
+  {
+   "group": "Links",
+   "link_doctype": "Cohort Join Request",
+   "link_fieldname": "subgroup"
+  }
+ ],
+ "modified": "2021-12-16 15:12:42.504883",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort Subgroup",
+ "naming_rule": "Expression",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort_subgroup/cohort_subgroup.py b/school/lms/doctype/cohort_subgroup/cohort_subgroup.py
new file mode 100644
index 00000000..dfb810b0
--- /dev/null
+++ b/school/lms/doctype/cohort_subgroup/cohort_subgroup.py
@@ -0,0 +1,95 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.model.document import Document
+from frappe.utils import random_string
+
+class CohortSubgroup(Document):
+    def before_save(self):
+        if not self.invite_code:
+            self.invite_code = random_string(8)
+
+    def get_url(self):
+        cohort = frappe.get_doc("Cohort", self.cohort)
+        return f"{frappe.utils.get_url()}/courses/{self.course}/subgroups/{cohort.slug}/{self.slug}"
+
+    def get_invite_link(self):
+        cohort = frappe.get_doc("Cohort", self.cohort)
+        return f"{frappe.utils.get_url()}/courses/{self.course}/join/{cohort.slug}/{self.slug}/{self.invite_code}"
+
+    def has_student(self, email):
+        """Check if given user is a student of this subgroup.
+        """
+        q = {
+            "doctype": "LMS Batch Membership",
+            "subgroup": self.name,
+            "member": email
+        }
+        return frappe.db.exists(q)
+
+    def has_join_request(self, email):
+        """Check if given user is a student of this subgroup.
+        """
+        q = {
+            "doctype": "Cohort Join Request",
+            "subgroup": self.name,
+            "email": email
+        }
+        return frappe.db.exists(q)
+
+    def get_join_requests(self, status="Pending"):
+        q = {
+            "subgroup": self.name,
+            "status": status
+        }
+        return frappe.get_all("Cohort Join Request", filters=q, fields=["*"], order_by="creation desc")
+
+    def get_mentors(self):
+        emails = frappe.get_all("Cohort Mentor", filters={"subgroup": self.name}, fields=["email"], pluck='email')
+        return self._get_users(emails)
+
+    def get_students(self):
+        emails = frappe.get_all("LMS Batch Membership",
+            filters={"subgroup": self.name},
+            fields=["member"],
+            pluck='member',
+            page_length=1000)
+        return self._get_users(emails)
+
+    def _get_users(self, emails):
+        users = [frappe.get_cached_doc("User", email) for email in emails]
+        return sorted(users, key=lambda user: user.full_name)
+
+    def is_mentor(self, email):
+        q = {
+            "doctype": "Cohort Mentor",
+            "subgroup": self.name,
+            "email": email
+        }
+        return frappe.db.exists(q)
+
+    def is_manager(self, email):
+        """Returns True if the given user is a manager of this subgroup.
+
+        Mentors of the subgroup, admins of the Cohort are considered as managers.
+        """
+        return self.is_mentor(email) or self.get_cohort().is_admin(email)
+
+    def get_cohort(self):
+        return frappe.get_doc("Cohort", self.cohort)
+
+    def add_mentor(self, email):
+        d = {
+            "doctype": "Cohort Mentor",
+            "subgroup": self.name,
+            "cohort": self.cohort,
+            "email": email
+        }
+        if frappe.db.exists(d):
+            return
+        doc = frappe.get_doc(d)
+        doc.insert(ignore_permissions=True)
+
+#def after_doctype_insert():
+#    frappe.db.add_unique("Cohort Subgroup", ("cohort", "slug"))
diff --git a/school/lms/doctype/cohort_subgroup/test_cohort_subgroup.py b/school/lms/doctype/cohort_subgroup/test_cohort_subgroup.py
new file mode 100644
index 00000000..8715a234
--- /dev/null
+++ b/school/lms/doctype/cohort_subgroup/test_cohort_subgroup.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestCohortSubgroup(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/cohort_web_page/__init__.py b/school/lms/doctype/cohort_web_page/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/cohort_web_page/cohort_web_page.json b/school/lms/doctype/cohort_web_page/cohort_web_page.json
new file mode 100644
index 00000000..fac05f0e
--- /dev/null
+++ b/school/lms/doctype/cohort_web_page/cohort_web_page.json
@@ -0,0 +1,64 @@
+{
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2021-12-04 23:28:40.429867",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "slug",
+  "title",
+  "template",
+  "scope",
+  "required_role"
+ ],
+ "fields": [
+  {
+   "fieldname": "title",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Title",
+   "reqd": 1
+  },
+  {
+   "fieldname": "template",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Template",
+   "options": "Web Template",
+   "reqd": 1
+  },
+  {
+   "default": "Cohort",
+   "fieldname": "scope",
+   "fieldtype": "Select",
+   "label": "Scope",
+   "options": "Cohort\nSubgroup"
+  },
+  {
+   "default": "Public",
+   "fieldname": "required_role",
+   "fieldtype": "Select",
+   "label": "Required Role",
+   "options": "Public\nStudent\nMentor\nAdmin"
+  },
+  {
+   "fieldname": "slug",
+   "fieldtype": "Data",
+   "in_list_view": 1,
+   "label": "Slug",
+   "reqd": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-12-04 23:33:03.954128",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Cohort Web Page",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC"
+}
\ No newline at end of file
diff --git a/school/lms/doctype/cohort_web_page/cohort_web_page.py b/school/lms/doctype/cohort_web_page/cohort_web_page.py
new file mode 100644
index 00000000..b290954e
--- /dev/null
+++ b/school/lms/doctype/cohort_web_page/cohort_web_page.py
@@ -0,0 +1,9 @@
+# Copyright (c) 2021, Frappe and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe.model.document import Document
+
+class CohortWebPage(Document):
+    def get_template_html(self):
+        return frappe.get_doc("Web Template", self.template).template
diff --git a/school/lms/doctype/exercise/exercise.py b/school/lms/doctype/exercise/exercise.py
index a7e3308d..faccd1b7 100644
--- a/school/lms/doctype/exercise/exercise.py
+++ b/school/lms/doctype/exercise/exercise.py
@@ -36,7 +36,7 @@ class Exercise(Document):
             return old_submission
 
         course = frappe.get_doc("LMS Course", self.course)
-        batch = course.get_student_batch(user)
+        member = course.get_membership(frappe.session.user)
 
         doc = frappe.get_doc(
             doctype="Exercise Submission",
@@ -44,8 +44,9 @@ class Exercise(Document):
             exercise_title=self.title,
             course=self.course,
             lesson=self.lesson,
-            batch=batch and batch.name,
-            solution=code)
+            batch=member.batch,
+            solution=code,
+            member=member.name)
         doc.insert(ignore_permissions=True)
 
         return doc
diff --git a/school/lms/doctype/exercise/test_exercise.py b/school/lms/doctype/exercise/test_exercise.py
index c68f3212..9a4a45fd 100644
--- a/school/lms/doctype/exercise/test_exercise.py
+++ b/school/lms/doctype/exercise/test_exercise.py
@@ -6,6 +6,7 @@ import unittest
 
 class TestExercise(unittest.TestCase):
     def setUp(self):
+        frappe.db.sql('delete from `tabLMS Batch Membership`')
         frappe.db.sql('delete from `tabExercise Submission`')
         frappe.db.sql('delete from `tabExercise`')
         frappe.db.sql('delete from `tabLMS Course`')
@@ -19,6 +20,12 @@ class TestExercise(unittest.TestCase):
             "description": "Test Course"
         })
         course.insert()
+        member = frappe.get_doc({
+            "doctype": "LMS Batch Membership",
+            "course": course.name,
+            "member": frappe.session.user
+        })
+        member.insert()
         e = frappe.get_doc({
             "doctype": "Exercise",
             "name": "test-problem",
diff --git a/school/lms/doctype/exercise_latest_submission/__init__.py b/school/lms/doctype/exercise_latest_submission/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.js b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.js
new file mode 100644
index 00000000..aea1f03d
--- /dev/null
+++ b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.js
@@ -0,0 +1,8 @@
+// Copyright (c) 2021, Frappe and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Exercise Latest Submission', {
+	// refresh: function(frm) {
+
+	// }
+});
diff --git a/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.json b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.json
new file mode 100644
index 00000000..16ee0a6f
--- /dev/null
+++ b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.json
@@ -0,0 +1,166 @@
+{
+ "actions": [],
+ "creation": "2021-12-08 17:56:26.049675",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "exercise",
+  "status",
+  "batch",
+  "column_break_4",
+  "exercise_title",
+  "course",
+  "lesson",
+  "section_break_8",
+  "solution",
+  "image",
+  "test_results",
+  "comments",
+  "latest_submission",
+  "member",
+  "member_email",
+  "member_cohort",
+  "member_subgroup"
+ ],
+ "fields": [
+  {
+   "fieldname": "exercise",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "in_standard_filter": 1,
+   "label": "Exercise",
+   "options": "Exercise",
+   "search_index": 1
+  },
+  {
+   "fieldname": "status",
+   "fieldtype": "Select",
+   "label": "Status",
+   "options": "Correct\nIncorrect"
+  },
+  {
+   "fieldname": "batch",
+   "fieldtype": "Link",
+   "label": "Batch",
+   "options": "LMS Batch"
+  },
+  {
+   "fieldname": "column_break_4",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fetch_from": "exercise.title",
+   "fieldname": "exercise_title",
+   "fieldtype": "Data",
+   "label": "Exercise Title",
+   "read_only": 1
+  },
+  {
+   "fetch_from": "exercise.course",
+   "fieldname": "course",
+   "fieldtype": "Link",
+   "in_standard_filter": 1,
+   "label": "Course",
+   "options": "LMS Course",
+   "read_only": 1
+  },
+  {
+   "fetch_from": "exercise.lesson",
+   "fieldname": "lesson",
+   "fieldtype": "Link",
+   "label": "Lesson",
+   "options": "Course Lesson"
+  },
+  {
+   "fieldname": "section_break_8",
+   "fieldtype": "Section Break"
+  },
+  {
+   "fetch_from": "latest_submission.solution",
+   "fieldname": "solution",
+   "fieldtype": "Code",
+   "label": "Solution"
+  },
+  {
+   "fetch_from": "latest_submission.image",
+   "fieldname": "image",
+   "fieldtype": "Code",
+   "label": "Image",
+   "read_only": 1
+  },
+  {
+   "fetch_from": "latest_submission.test_results",
+   "fieldname": "test_results",
+   "fieldtype": "Small Text",
+   "label": "Test Results"
+  },
+  {
+   "fieldname": "comments",
+   "fieldtype": "Small Text",
+   "label": "Comments"
+  },
+  {
+   "fieldname": "latest_submission",
+   "fieldtype": "Link",
+   "label": "Latest Submission",
+   "options": "Exercise Submission"
+  },
+  {
+   "fieldname": "member",
+   "fieldtype": "Link",
+   "label": "Member",
+   "options": "LMS Batch Membership"
+  },
+  {
+   "fetch_from": "member.member",
+   "fieldname": "member_email",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "in_standard_filter": 1,
+   "label": "Member Email",
+   "options": "User",
+   "search_index": 1
+  },
+  {
+   "fetch_from": "member.cohort",
+   "fieldname": "member_cohort",
+   "fieldtype": "Link",
+   "label": "Member Cohort",
+   "options": "Cohort",
+   "search_index": 1
+  },
+  {
+   "fetch_from": "member.subgroup",
+   "fieldname": "member_subgroup",
+   "fieldtype": "Link",
+   "label": "Member Subgroup",
+   "options": "Cohort Subgroup",
+   "search_index": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2021-12-08 22:58:46.312861",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Exercise Latest Submission",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}
\ No newline at end of file
diff --git a/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.py b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.py
new file mode 100644
index 00000000..43a7f5cd
--- /dev/null
+++ b/school/lms/doctype/exercise_latest_submission/exercise_latest_submission.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Frappe and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class ExerciseLatestSubmission(Document):
+	pass
diff --git a/school/lms/doctype/exercise_latest_submission/test_exercise_latest_submission.py b/school/lms/doctype/exercise_latest_submission/test_exercise_latest_submission.py
new file mode 100644
index 00000000..76825ecd
--- /dev/null
+++ b/school/lms/doctype/exercise_latest_submission/test_exercise_latest_submission.py
@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Frappe and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestExerciseLatestSubmission(unittest.TestCase):
+	pass
diff --git a/school/lms/doctype/exercise_submission/exercise_submission.json b/school/lms/doctype/exercise_submission/exercise_submission.json
index 229e9de6..def5f1f7 100644
--- a/school/lms/doctype/exercise_submission/exercise_submission.json
+++ b/school/lms/doctype/exercise_submission/exercise_submission.json
@@ -16,7 +16,8 @@
   "solution",
   "image",
   "test_results",
-  "comments"
+  "comments",
+  "member"
  ],
  "fields": [
   {
@@ -90,11 +91,17 @@
   {
    "fieldname": "section_break_8",
    "fieldtype": "Section Break"
+  },
+  {
+   "fieldname": "member",
+   "fieldtype": "Link",
+   "label": "Member",
+   "options": "LMS Batch Membership"
   }
  ],
  "index_web_pages_for_search": 1,
  "links": [],
- "modified": "2021-09-29 15:27:57.273879",
+ "modified": "2021-12-08 22:25:05.809376",
  "modified_by": "Administrator",
  "module": "LMS",
  "name": "Exercise Submission",
diff --git a/school/lms/doctype/exercise_submission/exercise_submission.py b/school/lms/doctype/exercise_submission/exercise_submission.py
index d588281c..7209826f 100644
--- a/school/lms/doctype/exercise_submission/exercise_submission.py
+++ b/school/lms/doctype/exercise_submission/exercise_submission.py
@@ -5,4 +5,20 @@ import frappe
 from frappe.model.document import Document
 
 class ExerciseSubmission(Document):
-    pass
+    def on_update(self):
+        self.update_latest_submission()
+
+    def update_latest_submission(self):
+        names = frappe.get_all("Exercise Latest Submission", {"exercise": self.exercise, "member": self.member})
+        if names:
+            doc = frappe.get_doc("Exercise Latest Submission", names[0])
+            doc.latest_submission = self.name
+            doc.save(ignore_permissions=True)
+        else:
+            doc = frappe.get_doc({
+                "doctype": "Exercise Latest Submission",
+                "exercise": self.exercise,
+                "member": self.member,
+                "latest_submission": self.name
+            })
+            doc.insert(ignore_permissions=True)
diff --git a/school/lms/doctype/lms_batch_membership/lms_batch_membership.json b/school/lms/doctype/lms_batch_membership/lms_batch_membership.json
index 69720d29..35f74e35 100644
--- a/school/lms/doctype/lms_batch_membership/lms_batch_membership.json
+++ b/school/lms/doctype/lms_batch_membership/lms_batch_membership.json
@@ -6,15 +6,19 @@
  "engine": "InnoDB",
  "field_order": [
   "course",
-  "member",
-  "member_name",
-  "member_username",
+  "cohort",
+  "subgroup",
   "column_break_3",
   "batch",
+  "current_lesson",
+  "role",
+  "member_section",
+  "member",
   "member_type",
   "progress",
-  "current_lesson",
-  "role"
+  "column_break_12",
+  "member_name",
+  "member_username"
  ],
  "fields": [
   {
@@ -88,12 +92,32 @@
    "fieldtype": "Data",
    "label": "Progress",
    "read_only": 1
+  },
+  {
+   "fieldname": "cohort",
+   "fieldtype": "Link",
+   "label": "Cohort",
+   "options": "Cohort"
+  },
+  {
+   "fieldname": "subgroup",
+   "fieldtype": "Link",
+   "label": "Subgroup",
+   "options": "Cohort Subgroup"
+  },
+  {
+   "fieldname": "member_section",
+   "fieldtype": "Section Break",
+   "label": "Member"
+  },
+  {
+   "fieldname": "column_break_12",
+   "fieldtype": "Column Break"
   }
  ],
  "index_web_pages_for_search": 1,
  "links": [],
- "migration_hash": "fe10c462acf5e727d864305d7ce90e73",
- "modified": "2021-10-20 15:10:33.767419",
+ "modified": "2021-12-16 14:49:25.964853",
  "modified_by": "Administrator",
  "module": "LMS",
  "name": "LMS Batch Membership",
diff --git a/school/lms/doctype/lms_course/lms_course.py b/school/lms/doctype/lms_course/lms_course.py
index b9993cbe..9562445c 100644
--- a/school/lms/doctype/lms_course/lms_course.py
+++ b/school/lms/doctype/lms_course/lms_course.py
@@ -210,6 +210,28 @@ class LMSCourse(Document):
             visibility="Public")
         return batches
 
+    def get_cohorts(self):
+        return find_all("Cohort", course=self.name, order_by="creation")
+
+    def get_cohort(self, cohort_slug):
+        name = frappe.get_value("Cohort", {"course": self.name, "slug": cohort_slug})
+        return name and frappe.get_doc("Cohort", name)
+
+    def is_cohort_staff(self, user_email):
+        """Returns True if the user is either a mentor or a staff for one or more active cohorts of this course.
+        """
+        q1 = {
+            "doctype": "Cohort Staff",
+            "course": self.name,
+            "email": user_email
+        }
+        q2 = {
+            "doctype": "Cohort Mentor",
+            "course": self.name,
+            "email": user_email
+        }
+        return frappe.db.exists(q1) or frappe.db.exists(q2)
+
     def get_lesson_index(self, lesson_name):
         """Returns the {chapter_index}.{lesson_index} for the lesson.
         """
diff --git a/school/templates/exercise.html b/school/templates/exercise.html
index fca923b7..4af77867 100644
--- a/school/templates/exercise.html
+++ b/school/templates/exercise.html
@@ -1,5 +1,5 @@
 <div class="exercise">
-  <h3>Exercise {{exercise.index_label}}: {{ exercise.title }}</h3>
+  <h3><a name="E{{exercise.index_label}}">Exercise {{exercise.index_label}}: {{ exercise.title }}</a></h3>
   <div class="exercise-description">{{frappe.utils.md_to_html(exercise.description)}}</div>
 
   {% set submission = exercise.get_user_submission() %}
diff --git a/school/www/cohorts/__init__.py b/school/www/cohorts/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/school/www/cohorts/base.html b/school/www/cohorts/base.html
new file mode 100644
index 00000000..f0177dc4
--- /dev/null
+++ b/school/www/cohorts/base.html
@@ -0,0 +1,34 @@
+{% extends "templates/base.html" %}
+
+{% macro render_nav(nav) %}
+
+<div class="breadcrumb">
+  {% for link in nav %}
+    <a class="dark-links" href="{{ link.href }}">{{ link.title }}</a>
+    {% if not loop.last %}
+    <img class="ml-1 mr-1" src="/assets/school/icons/chevron-right.svg">
+    {% endif %}
+  {% endfor %}
+</div>
+{% endmacro %}
+
+{% block title %}Cohorts{% endblock %}
+{% block head_include %}
+<meta name="description" content="Cohorts" />
+<meta name="keywords" content="Cohorts" />
+{% endblock %}
+
+
+{% block content %}
+<div class="common-page-style">
+  <div class='container'>
+    {{ render_nav(nav | default([])) }}
+
+    {% block page_content %}
+    Hello, world!
+    {% endblock %}
+  </div>
+</div>
+{% endblock %}
+
+
diff --git a/school/www/cohorts/cohort.html b/school/www/cohorts/cohort.html
new file mode 100644
index 00000000..007e5d70
--- /dev/null
+++ b/school/www/cohorts/cohort.html
@@ -0,0 +1,77 @@
+{% extends "www/cohorts/base.html" %}
+{% block title %}Manage {{ course.title  }}{% endblock %}
+
+{% block page_content %}
+<h2>{{cohort.title}} <span class="badge badge-secondary">Cohort</span></h2>
+
+<p>
+  {% set stats = cohort.get_stats() %}
+
+  {{ stats.subgroups }} Subgroups
+  | {{ stats.mentors }} Mentors
+  | {{ stats.students }} students
+  | {{ stats.join_requests }} join requests
+</p>
+
+{% if is_mentor %}
+<div class="alert alert-info">
+  {% set sg = mentor.get_subgroup() %}
+  <p>You are a mentor of <b>{{sg.title}}</b> subgroup.</p>
+  <p><a href="{{sg.get_url()}}" class="btn btn-primary">Visit Your Subgroup &rarr;</a></p>
+</div>
+{% endif %}
+
+<ul class="nav nav-tabs">
+  {% set num_subgroups = cohort.get_subgroups() | length %}
+  {{ render_navitem("Subgroups", "", page=page, count=num_subgroups) }}
+  {% for p in cohort.get_pages(scope="Cohort") %}
+    {{ render_navitem(p.title, p.slug, page=page) }}
+  {% endfor %}
+</ul>
+
+<div class="my-5">
+{% if not page %}
+  {{ render_subgroups() }}
+{% else %}
+  {{ render_page(page) }}
+{% endif %}
+</div>
+
+{% endblock %}
+
+{% macro render_subgroups() %}
+<ul class="list-group">
+  {% for sg in cohort.get_subgroups(include_counts=True) %}
+    <li class="list-group-item">
+      <div>
+        <a class="subgroup-title"
+          style="font-weight: 700; color: inherit;"
+          href="/courses/{{course.name}}/subgroups/{{cohort.slug}}/{{sg.slug}}"
+          >{{sg.title}}</a>
+        </div>
+      <div style="font-size: 0.8em;">
+        {{sg.num_mentors}} Mentors
+        |
+        {{sg.num_students}} Students
+        |
+        {{sg.num_join_requests}} Join Requests
+      </div>
+    </li>
+  {% endfor %}
+</ul>
+{% endmacro %}
+
+{% macro render_navitem(title, link, page, count=-1) %}
+  <li class="nav-item">
+    <a
+      class="nav-link {{ 'active' if link==page }}"
+      href="/courses/{{course.name}}/cohorts/{{cohort.slug}}/{{link}}"
+    >{{title}}
+    {% if count != -1 %}
+      <span
+        class="badge {{'badge-primary' if link==page else 'badge-secondary'}}"
+      >{{count}}</span>
+    {% endif %}
+    </a>
+  </li>
+{% endmacro %}
diff --git a/school/www/cohorts/cohort.py b/school/www/cohorts/cohort.py
new file mode 100644
index 00000000..64c63757
--- /dev/null
+++ b/school/www/cohorts/cohort.py
@@ -0,0 +1,32 @@
+import frappe
+from . import utils
+
+def get_context(context):
+    context.no_cache = 1
+    course = utils.get_course()
+    cohort = course and utils.get_cohort(course, frappe.form_dict["cohort"])
+    if not cohort:
+        context.template = "www/404.html"
+        return
+
+    user = frappe.session.user
+    mentor = cohort.get_mentor(user)
+    is_mentor = mentor is not None
+    is_admin = cohort.is_admin(user) or "System Manager" in frappe.get_roles()
+
+    utils.add_nav(context, "All Courses", "/courses")
+    utils.add_nav(context, course.title, "/courses/" + course.name)
+    utils.add_nav(context, "Cohorts", "/courses/" + course.name + "/manage")
+
+    context.course = course
+    context.cohort = cohort
+    context.mentor = mentor
+    context.is_mentor = is_mentor
+    context.is_admin = is_admin
+    context.page = frappe.form_dict.get("page") or ""
+    context.page_scope = "Cohort"
+
+    # Function to render to custom page given the slug
+    context.render_page = lambda page: frappe.render_template(
+        cohort.get_page_template(page, scope="Cohort"),
+        context)
diff --git a/school/www/cohorts/index.html b/school/www/cohorts/index.html
new file mode 100644
index 00000000..68009df8
--- /dev/null
+++ b/school/www/cohorts/index.html
@@ -0,0 +1,38 @@
+{% extends "www/cohorts/base.html" %}
+{% block title %}Manage {{ course.title  }}{% endblock %}
+
+{% block page_content %}
+  {% if cohorts %}
+    <h2>Cohorts</h2>
+    <div class="row">
+    {% for cohort in cohorts %}
+      <div class="col-md-6">
+      {{ render_cohort(course, cohort) }}
+      </div>
+    {% endfor %}
+    </div>
+  {% else %}
+      <h2>Permission Denied</h2>
+      <p>You don't have permission to manage this course.</p>
+  {% endif %}
+{% endblock %}
+
+{% macro render_cohort(course, cohort) %}
+<div class="card">
+  <div class="card-body">
+    <h5 class="card-title">{{cohort.title}}</h5>
+    <h6 class="card-subtitle mb-2 text-muted">{{cohort.begin_date}} - {{cohort.end_date}}</h6>
+    <p>
+      {% set stats = cohort.get_stats() %}
+
+      {{ stats.subgroups }} Subgroups
+      | {{ stats.mentors }} Mentors
+      | {{ stats.students }} students
+      | {{ stats.join_requests }} join requests
+    </p>
+
+    <a href="/courses/{{course.name}}/cohorts/{{cohort.slug}}" class="card-link">Manage</a>
+  </div>
+</div>
+
+{% endmacro %}
diff --git a/school/www/cohorts/index.py b/school/www/cohorts/index.py
new file mode 100644
index 00000000..2d1f648b
--- /dev/null
+++ b/school/www/cohorts/index.py
@@ -0,0 +1,31 @@
+import frappe
+from .utils import get_course, add_nav
+
+def get_context(context):
+    context.no_cache = 1
+    context.course = get_course()
+    if frappe.session.user == "Guest":
+        frappe.local.flags.redirect_location = "/login?redirect-to=" + frappe.request.path
+        raise frappe.Redirect()
+
+    if not context.course:
+        context.template = "www/404.html"
+        return
+
+    context.cohorts = get_cohorts(context.course)
+    if len(context.cohorts) == 1:
+        frappe.local.flags.redirect_location = context.cohorts[0].get_url()
+        raise frappe.Redirect
+
+    add_nav(context, "All Courses", "/courses")
+    add_nav(context, context.course.title, "/courses/" + context.course.name)
+
+def get_cohorts(course):
+    if "System Manager" in frappe.get_roles():
+        return course.get_cohorts()
+
+    staff_roles = frappe.get_all("Cohort Staff", filters={"course": course.name}, fields=["cohort"])
+    mentor_roles = frappe.get_all("Cohort Mentor", filters={"course": course.name}, fields=["cohort"])
+    roles = staff_roles + mentor_roles
+    names = {role.cohort for role in roles}
+    return [frappe.get_doc("Cohort", name) for name in names]
diff --git a/school/www/cohorts/join.html b/school/www/cohorts/join.html
new file mode 100644
index 00000000..34b55c2e
--- /dev/null
+++ b/school/www/cohorts/join.html
@@ -0,0 +1,88 @@
+{% extends "www/cohorts/base.html" %}
+
+{% block title %}Join Course{% endblock %}
+
+{% block page_content %}
+
+<h2>Join Course</h2>
+
+<p>
+  Course: {{course.title}}
+</p>
+<p>
+  Cohort: {{cohort.title}}
+</p>
+<p>
+  Subgroup: {{subgroup.title}}
+</p>
+
+{% if frappe.session.user == "Guest" %}
+
+<div class="alert alert-warning">
+  <p>
+  Please login to be able to join the course.</p>
+
+  <p>
+  If you don't already have an account, you can <a href="/login#signup">sign up for a new account</a>.
+  </p>
+  <a class="btn btn-primary" href="/login">Login to continue</a>
+</div>
+{% elif subgroup.has_student(frappe.session.user) %}
+  <div class="alert alert-info">
+    <p>You are already a student of this course.</p>
+    <a class="btn btn-primary" href="/">Start Learning &rarr;</a>
+  </div>
+{% elif subgroup.has_join_request(frappe.session.user) %}
+  <div class="alert alert-info">
+    <p>We have received your request to join the course. You'll hear back from us soon.</p>
+  </div>
+{% else %}
+
+<a class="btn btn-primary" id="join">Join the course</a>
+
+{% endif %}
+
+{% endblock %}
+
+{% block script %}
+
+<script type="text/javascript">
+
+$(function() {
+  console.log("ready!")
+  $("#join").click(function() {
+    var parts = window.location.pathname.split("/")
+    var course = parts[2];
+    var cohort = parts[4];
+    var subgroup = parts[5];
+    var invite_code = parts[6];
+
+    frappe.call('school.lms.api.join_cohort', {
+      course: course,
+      cohort: cohort,
+      subgroup: subgroup,
+      invite_code: invite_code
+    })
+    .then(r => {
+      if (r.message.ok) {
+        let d = new frappe.ui.Dialog({
+          title: "Notification",
+          primary_action_label: "Proceed",
+          primary_action() {
+            d.hide();
+            window.location.reload();
+          }
+        });
+        var message = "We've received your interest to join the course. We'll hear from us soon.";
+        d.show();
+        d.set_message(message);
+      }
+      else {
+        frappe.msgprint(r.message.error);
+      }
+    });
+  });
+});
+</script>
+
+{% endblock %}
diff --git a/school/www/cohorts/join.py b/school/www/cohorts/join.py
new file mode 100644
index 00000000..4b6368a3
--- /dev/null
+++ b/school/www/cohorts/join.py
@@ -0,0 +1,24 @@
+import frappe
+from . import utils
+
+def get_context(context):
+    context.no_cache = 1
+
+    course = utils.get_course(frappe.form_dict["course"])
+    cohort = course and utils.get_cohort(course, frappe.form_dict["cohort"])
+    subgroup = cohort and utils.get_subgroup(cohort, frappe.form_dict["subgroup"])
+    if not subgroup:
+        context.template = "www/404.html"
+        return
+
+    invite_code = frappe.form_dict["invite_code"]
+    if subgroup.invite_code != invite_code:
+        context.template = "www/404.html"
+        return
+
+    utils.add_nav(context, "All Courses", "/courses")
+    utils.add_nav(context, course.title, "/courses/" + course.name)
+
+    context.course = course
+    context.cohort = cohort
+    context.subgroup = subgroup
diff --git a/school/www/cohorts/subgroup.html b/school/www/cohorts/subgroup.html
new file mode 100644
index 00000000..a7d69895
--- /dev/null
+++ b/school/www/cohorts/subgroup.html
@@ -0,0 +1,264 @@
+{% extends "www/cohorts/base.html" %}
+{% block title %} Subgroup {{subgroup.title}} - {{ course.title }} {% endblock %}
+
+{% block page_content %}
+    <h2 id="page-title"
+      data-subgroup="{{subgroup.name}}"
+      data-title="{{subgroup.title}}"
+    >{{subgroup.title}} <span class="badge badge-secondary">Subgroup</span></h2>
+
+    <ul class="nav nav-tabs">
+      {{ render_navitem("Mentors", "/mentors", stats.mentors, page=="mentors")}}
+      {{ render_navitem("Students", "/students", stats.students, page=="students")}}
+      {% if is_mentor or is_admin %}
+        {{ render_navitem("Join Requests", "/join-requests", stats.join_requests, page=="join-requests")}}
+
+        {% for p in cohort.get_pages(scope="Subgroup") %}
+          {{ render_navitem(p.title, "/" + p.slug, -1, page==p.slug) }}
+        {% endfor %}
+      {% endif %}
+      {% if is_admin %}
+        {{ render_navitem("Admin", "/admin", -1, page=="admin")}}
+      {% endif %}
+      </ul>
+    <div class="my-5">
+    {% if page == "info" %}
+      {{ render_info() }}
+    {% elif page == "mentors" %}
+      {{ render_mentors() }}
+    {% elif page == "students" %}
+      {{ render_students() }}
+    {% elif page == "join-requests" %}
+      {{ render_join_requests() }}
+    {% elif page == "admin" %}
+      {{ render_admin() }}
+    {% else %}
+      {{ render_page(page) }}
+    {% endif %}
+    </div>
+{% endblock %}
+
+{% macro render_admin() %}
+<div style="background: white; padding: 20px;">
+  <h5>Add a new mentor</h5>
+<form id="add-mentor-form">
+  <div class="form-group">
+    <input type="email" class="form-control" id="mentor-email" aria-describedby="emailHelp" placeholder="E-mail address">
+  </div>
+  <button type="button" class="btn btn-primary" id="add-mentor">Add Mentor</button>
+</form>
+</div>
+{% endmacro %}
+
+{% macro render_mentors() %}
+    <h5>Mentors</h5>
+    {% set mentors = subgroup.get_mentors() %}
+    {% if mentors %}
+      <div class="mentors-section">
+      {% for m in mentors %}
+        {{ widgets.MemberCard(member=m, show_course_count=False, dimension_class="") }}
+      {% endfor %}
+      </div>
+    {% else %}
+      <em>None found.</em>
+    {% endif %}
+{% endmacro %}
+
+
+{% macro render_students() %}
+  {% set students = subgroup.get_students() %}
+  {% if students %}
+  <div class="mentors-section">
+    {% for student in students %}
+      {{ widgets.MemberCard(member=student, show_course_count=False, dimension_class="") }}
+    {% endfor %}
+  </div>
+  {% else %}
+    <em>None found.</em>
+  {% endif %}
+{% endmacro %}
+
+
+{% macro render_join_requests() %}
+  <h5>Invite Link</h5>
+  {% set link = subgroup.get_invite_link() %}
+  <p><a href="{{ link }}" id="invite-link">{{link}}</a>
+  <br>
+  <a class="btn btn-seconday btn-sm" id="copy-to-clipboard">Copy to Clipboard</a>
+  </p>
+
+{% set join_requests = subgroup.get_join_requests() %}
+  <h5>Pending Requests</h5>
+  {% if join_requests %}
+  <table class="table">
+    <tr>
+      <th>#</th>
+      <th>When</th>
+      <th>Email</th>
+      <th>Actions</th>
+    </tr>
+    {% for r in join_requests %}
+    <tr>
+        <td>{{loop.index}}</td>
+        <td class="timestamp">{{r.creation}}</td>
+        <td>{{r.email}}</td>
+        <td class="actions"
+          data-name="{{r.name}}"
+          data-email="{{r.email}}">
+          <a class="action-approve" href="#">Approve</a> | <a class="action-reject" href="#">Reject</a></td>
+    </tr>
+    {% endfor %}
+  </table>
+  {% else %}
+    <p><em>There are no pending join requests.</em></p>
+  {% endif %}
+  {% set rejected_requests = subgroup.get_join_requests(status="Rejected") %}
+
+  <h5>Rejected Requests</h5>
+  {% if rejected_requests %}
+    <table class="table">
+      <tr>
+        <th>#</th>
+        <th>When</th>
+        <th>Email</th>
+        <th>Actions</th>
+      </tr>
+    {% for r in rejected_requests %}
+      <tr>
+        <td>{{loop.index}}</td>
+        <td class="timestamp">{{r.creation}}</td>
+        <td>{{r.email}}</td>
+        <td class="actions"
+          data-name="{{r.name}}"
+          data-email="{{r.email}}">
+          <a class="action-undo" href="#">Undo</a></td>
+      </tr>
+    {% endfor %}
+    </table>
+  {% else %}
+    <p><em>There are no rejected requests.</em></p>
+  {% endif %}
+{% endmacro %}
+
+{% macro render_navitem(title, link, count, active) %}
+  <li class="nav-item">
+    <a
+      class="nav-link {{ 'active' if active }}"
+      href="/courses/{{course.name}}/subgroups/{{cohort.slug}}/{{subgroup.slug}}{{link}}"
+    >{{title}}
+    {% if count != -1 %}
+      <span
+        class="badge {{'badge-primary' if active else 'badge-secondary'}}"
+      >{{count}}</span>
+    {% endif %}
+    </a>
+  </li>
+{% endmacro %}
+
+
+{% block script %}
+
+<script type="text/javascript">
+$(function() {
+  $("#copy-to-clipboard").click(function() {
+    var invite_link = $("#invite-link").text();
+    navigator.clipboard.writeText(invite_link)
+    .then(() => {
+      $("#copy-to-clipboard").text("Copied!");
+      setTimeout(
+        () => $("#copy-to-clipboard").text("Copy to Clipboard"),
+        500);
+     });
+  });
+
+  $(".timestamp"). each(function() {
+    var t = moment($(this).text());
+    var dt = t.from(moment.now());
+    $(this).text(dt);
+  });
+
+  $(".action-approve").click(function() {
+    var el = $(this).parent().parent();
+    var name = $(this).parent().data("name");
+    var email = $(this).parent().data("email");
+
+    frappe.confirm(
+      `Are you sure to accept ${email} to this subgroup?`,
+      function() {
+        run_action("school.lms.api.approve_cohort_join_request", name, el, "approved", "Approved");
+      }
+    );
+  });
+
+  $(".action-reject").click(function() {
+    var el = $(this).parent().parent();
+    var name = $(this).parent().data("name");
+    var email = $(this).parent().data("email");
+    frappe.confirm(`Are you sure to reject <strong>${email}</strong> from joining this subgroup?`, function() {
+      run_action("school.lms.api.reject_cohort_join_request", name, el, "rejected", "Rejected!");
+    });
+  });
+
+  $(".action-undo").click(function() {
+    var el = $(this).parent().parent();
+    var name = $(this).parent().data("name");
+    var email = $(this).parent().data("email");
+    frappe.confirm(`Are you sure to undo the rejection of <strong>${email}</strong>?`, function() {
+      run_action("school.lms.api.undo_reject_cohort_join_request", name, el, "undo-reject", "Reject Undone!");
+    });
+  });
+
+  function run_action(method, join_request, elem, classname, label) {
+    frappe.call(method, {
+      join_request: join_request,
+    })
+    .then(r => {
+      if (r.message.ok) {
+        $(elem)
+          .addClass(classname)
+          .find("td.actions").html(label);
+      }
+      else {
+        frappe.msgprint(r.message.error);
+      }
+    });
+  }
+
+  $("#add-mentor").click(function() {
+    var subgroup = $("#page-title").data("subgroup");
+    var title = $("#page-title").data("title");
+    var email = $("#mentor-email").val();
+    frappe.call("school.lms.api.add_mentor_to_subgroup", {
+      subgroup: subgroup,
+      email: email
+    })
+    .then(r => {
+      if (r.message.ok) {
+        frappe.msgprint(`Successfully added ${email} as mentor to ${title}`);
+      }
+      else {
+        frappe.msgprint(r.message.error);
+      }
+    });
+  });
+});
+</script>
+{% endblock %}
+
+{% block style %}
+<style type="text/css">
+tr.approved {
+  background:#c3e6cb;
+  color: #155724;
+}
+
+tr.rejected {
+  background: #f8d7da;
+  color: #721c24;
+}
+
+tr.undo-reject {
+  background:#d6d8d9;
+}
+</style>
+{% endblock %}
diff --git a/school/www/cohorts/subgroup.py b/school/www/cohorts/subgroup.py
new file mode 100644
index 00000000..4ab8c056
--- /dev/null
+++ b/school/www/cohorts/subgroup.py
@@ -0,0 +1,67 @@
+import frappe
+from . import utils
+
+def get_context(context):
+    context.no_cache = 1
+    course = utils.get_course()
+
+    cohort = utils.get_cohort(course, frappe.form_dict['cohort'])
+    subgroup = utils.get_subgroup(cohort, frappe.form_dict['subgroup'])
+
+    if not subgroup:
+        context.template = "www/404.html"
+        return
+
+    page = frappe.form_dict.get("page")
+    is_mentor = subgroup.is_mentor(frappe.session.user)
+    is_admin = cohort.is_admin(frappe.session.user) or "System Manager" in frappe.get_roles()
+
+    if is_admin:
+        role = "Admin"
+    elif is_mentor:
+        role = "Mentor"
+    else:
+        role = "Public"
+
+    pages = [
+        ("mentors", ["Admin", "Mentor", "Public"]),
+        ("students", ["Admin", "Mentor", "Public"]),
+        ("join-requests", ["Admin", "Mentor"]),
+        ("admin", ["Admin"])
+    ]
+    pages += [(p.slug, ["Admin", "Mentor"]) for p in cohort.get_pages(scope="Subgroup")]
+
+    page_names = [p for p, roles in pages if role in roles]
+
+    if page not in page_names:
+        frappe.local.flags.redirect_location = subgroup.get_url() + "/mentors"
+        raise frappe.Redirect
+
+    utils.add_nav(context, "All Courses", "/courses")
+    utils.add_nav(context, course.title, f"/courses/{course.name}")
+    utils.add_nav(context, "Cohorts", f"/courses/{course.name}/manage")
+    utils.add_nav(context, cohort.title, f"/courses/{course.name}/cohorts/{cohort.slug}")
+
+    context.course = course
+    context.cohort = cohort
+    context.subgroup = subgroup
+    context.stats = get_stats(subgroup)
+    context.page = page
+    context.is_admin = is_admin
+    context.is_mentor = is_mentor
+    context.page_scope = "Subgroup"
+
+    # Function to render to custom page given the slug
+    context.render_page = lambda page: frappe.render_template(
+        cohort.get_page_template(page, scope="Subgroup"),
+        context)
+
+def get_stats(subgroup):
+    return {
+        "join_requests": len(subgroup.get_join_requests()),
+        "students": len(subgroup.get_students()),
+        "mentors": len(subgroup.get_mentors())
+    }
+
+def has_page(cohort, page):
+    return cohort.get_page(page, scope="Subgroup")
diff --git a/school/www/cohorts/utils.py b/school/www/cohorts/utils.py
new file mode 100644
index 00000000..a35c7e9f
--- /dev/null
+++ b/school/www/cohorts/utils.py
@@ -0,0 +1,25 @@
+import frappe
+
+def get_course(course_name=None):
+    course_name = course_name or frappe.form_dict["course"]
+    return course_name and get_doc("LMS Course", course_name)
+
+def get_doc(doctype, name):
+    try:
+        return frappe.get_doc(doctype, name)
+    except frappe.exceptions.DoesNotExistError:
+        return
+
+def get_cohort(course, cohort_slug):
+    name = frappe.get_value("Cohort", {"course": course.name, "slug": cohort_slug})
+    return name and frappe.get_doc("Cohort", name)
+
+def get_subgroup(cohort, subgroup_slug):
+    name = frappe.get_value("Cohort Subgroup", {"cohort": cohort.name, "slug": subgroup_slug})
+    return name and frappe.get_doc("Cohort Subgroup", name)
+
+def add_nav(context, title, href):
+    """Adds a breadcrumb to the navigation.
+    """
+    nav = context.setdefault("nav", [])
+    nav.append({"title": title, "href": href})
diff --git a/school/www/courses/course.html b/school/www/courses/course.html
index 364fdeec..9b169569 100644
--- a/school/www/courses/course.html
+++ b/school/www/courses/course.html
@@ -70,6 +70,14 @@
         <img class="ml-2" src="/assets/school/images/play.png" />
       </div>
       {% endif %}
+
+      {% if course.is_cohort_staff(frappe.session.user) %}
+        <a class="button wide-button is-secondary"
+           href="/courses/{{course.name}}/manage"
+           style="color: inherit;">
+          Manage the course
+        </a>
+      {% endif %}
     </div>
   </div>
 </div>