diff --git a/addons/website_slides/i18n/website_slides.pot b/addons/website_slides/i18n/website_slides.pot
index 3eb7085b545..f343cb39791 100644
--- a/addons/website_slides/i18n/website_slides.pot
+++ b/addons/website_slides/i18n/website_slides.pot
@@ -6,8 +6,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Server saas~13.2\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-02-13 08:34+0000\n"
-"PO-Revision-Date: 2020-02-13 08:34+0000\n"
+"POT-Creation-Date: 2020-02-28 13:21+0000\n"
+"PO-Revision-Date: 2020-02-28 13:21+0000\n"
 "Last-Translator: \n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -702,6 +702,13 @@ msgstr ""
 msgid "All Courses"
 msgstr ""
 
+#. module: website_slides
+#. openerp-web
+#: code:addons/website_slides/static/src/xml/website_slides_unsubscribe.xml:0
+#, python-format
+msgid "All completed classes and earned karma will be lost."
+msgstr ""
+
 #. module: website_slides
 #: model:ir.model.fields,help:website_slides.field_slide_channel__partner_ids
 msgid "All members of the channel."
diff --git a/addons/website_slides/models/slide_channel.py b/addons/website_slides/models/slide_channel.py
index fe5d298e5eb..47a823b6702 100644
--- a/addons/website_slides/models/slide_channel.py
+++ b/addons/website_slides/models/slide_channel.py
@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 import uuid
+from collections import defaultdict
 
 from dateutil.relativedelta import relativedelta
 
@@ -501,12 +502,56 @@ class Channel(models.Model):
         for channel in self:
             channel._action_add_members(channel.mapped('enroll_group_ids.users.partner_id'))
 
+    def _get_earned_karma(self, partner_ids):
+        """ Compute the number of karma earned by partners on a channel
+        Warning: this count will not be accurate if the configuration has been
+        modified after the completion of a course!
+        """
+        total_karma = defaultdict(int)
+
+        slide_completed = self.env['slide.slide.partner'].sudo().search([
+            ('partner_id', 'in', partner_ids),
+            ('channel_id', 'in', self.ids),
+            ('completed', '=', True),
+            ('quiz_attempts_count', '>', 0)
+        ])
+        for partner_slide in slide_completed:
+            slide = partner_slide.slide_id
+            if not slide.question_ids:
+                continue
+            gains = [slide.quiz_first_attempt_reward,
+                     slide.quiz_second_attempt_reward,
+                     slide.quiz_third_attempt_reward,
+                     slide.quiz_fourth_attempt_reward]
+            attempts = min(partner_slide.quiz_attempts_count - 1, 3)
+            total_karma[partner_slide.partner_id.id] += gains[attempts]
+
+        channel_completed = self.env['slide.channel.partner'].sudo().search([
+            ('partner_id', 'in', partner_ids),
+            ('channel_id', 'in', self.ids),
+            ('completed', '=', True)
+        ])
+        for partner_channel in channel_completed:
+            channel = partner_channel.channel_id
+            total_karma[partner_channel.partner_id.id] += channel.karma_gen_channel_finish
+
+        return total_karma
+
     def _remove_membership(self, partner_ids):
         """ Unlink (!!!) the relationships between the passed partner_ids
-        and the channels and their slides (done in the unlink of slide.channel.partner model). """
+        and the channels and their slides (done in the unlink of slide.channel.partner model).
+        Remove earned karma when completed quizz """
         if not partner_ids:
             raise ValueError("Do not use this method with an empty partner_id recordset")
 
+        earned_karma = self._get_earned_karma(partner_ids)
+        users = self.env['res.users'].sudo().search([
+            ('partner_id', 'in', list(earned_karma)),
+        ])
+        for user in users:
+            if earned_karma[user.partner_id.id]:
+                user.add_karma(-1 * earned_karma[user.partner_id.id])
+
         removed_channel_partner_domain = []
         for channel in self:
             removed_channel_partner_domain = expression.OR([
diff --git a/addons/website_slides/static/src/xml/website_slides_unsubscribe.xml b/addons/website_slides/static/src/xml/website_slides_unsubscribe.xml
index 53d4eb96c21..0c9d6a75414 100644
--- a/addons/website_slides/static/src/xml/website_slides_unsubscribe.xml
+++ b/addons/website_slides/static/src/xml/website_slides_unsubscribe.xml
@@ -22,6 +22,7 @@
 
     <t t-name="slides.course.unsubscribe.modal.leave">
         <p>Do you really want to leave the course?</p>
+        <p>All completed classes and earned karma will be lost.</p>
     </t>
 
 </templates>
diff --git a/addons/website_slides/tests/common.py b/addons/website_slides/tests/common.py
index 4e879865254..fa336fa0207 100644
--- a/addons/website_slides/tests/common.py
+++ b/addons/website_slides/tests/common.py
@@ -82,4 +82,19 @@ class SlidesCase(common.SavepointCase):
             'is_published': True,
             'completion_time': 1.5,
             'sequence': 4,
+            'quiz_first_attempt_reward': 42,
+        })
+        cls.question_1 = cls.env['slide.question'].with_user(cls.user_officer).create({
+            'question': 'How long should be cooked a human?',
+            'slide_id': cls.slide_3.id,
+        })
+        cls.answer_1 = cls.env['slide.answer'].with_user(cls.user_officer).create({
+            'question_id': cls.question_1.id,
+            'text_value': "25' at 180°C",
+            'is_correct': True,
+        })
+        cls.answer_2 = cls.env['slide.answer'].with_user(cls.user_officer).create({
+            'question_id': cls.question_1.id,
+            'text_value': "Raw",
+            'is_correct': False,
         })
diff --git a/addons/website_slides/tests/test_karma.py b/addons/website_slides/tests/test_karma.py
index cc92b1c4f3e..83e8374bec0 100644
--- a/addons/website_slides/tests/test_karma.py
+++ b/addons/website_slides/tests/test_karma.py
@@ -54,9 +54,16 @@ class TestKarmaGain(common.SlidesCase):
         # Finish the Course
         self.slide.with_user(user).action_set_completed()
         self.assertFalse(self.channel.with_user(user).completed)
-        (self.slide_2 | self.slide_3).with_user(user).action_set_completed()
-        self.assertTrue(self.channel.with_user(user).completed)
+        self.slide_2.with_user(user).action_set_completed()
+
+        # answer a quizz question
+        self.slide_3.with_user(user).action_set_viewed(quiz_attempts_inc=True)
+        self.slide_3.with_user(user)._action_set_quiz_done()
+        self.slide_3.with_user(user).action_set_completed()
+        computed_karma += self.slide_3.quiz_first_attempt_reward
         computed_karma += self.channel.karma_gen_channel_finish
+
+        self.assertTrue(self.channel.with_user(user).completed)
         self.assertEqual(user.karma, computed_karma)
 
         # Begin then finish the second Course
@@ -85,6 +92,12 @@ class TestKarmaGain(common.SlidesCase):
         slide_user.action_dislike()  # dislike again something already disliked should not remove karma again
         self.assertEqual(user.karma, computed_karma)
 
+        # Leave the finished course
+        self.channel._remove_membership(user.partner_id.ids)
+        computed_karma -= self.channel.karma_gen_channel_finish
+        computed_karma -= self.slide_3.quiz_first_attempt_reward
+        self.assertEqual(user.karma, computed_karma)
+
     @mute_logger('odoo.models')
     @users('user_emp', 'user_portal', 'user_officer')
     def test_karma_gain_multiple_course(self):