generally there is no such feature of wiping of completed courses with a request.
two things i can suggest
Use your secondary email to register to pega and complete the course
you can always switch btw the different version of pega during the training so if u start in 8.2 now trying completing the total course in 8.8 or above so that it can show all the new concepts and the latest features for you to complete and learn
Note: You can’t login from the secondary mail, Until unless you Make Primary mail, if you make primary, Otherside previous mail will not work for login
@Bhumireddy I think you misunderstood my point i asked him to use secondary email to register and start as a fresh user if he wants to complete the course.