Present learning paths and assign quizzes on Discord server.
Check out the home page for the full Discord Bot List.
Use completion of courses or quiz results as a condition for access to exclusive channels.
This also enables you to create sequenced learning paths like the serial modules on LMS. For instance, once a user completes the beginner course, user passes to the next level, in which she will encounter the next advanced course.
You can set the accuracy level for the pass or fail threshold; for instance, making the user proceed to exclusive channels if the ratio of correct answers is above 70%. Besides, unlike the rest of the quiz bots on Discord, questions and answers are only shown to the user itself.