A Revision test at certain intervals (weekly, monthly, etc) based on the previously taken lessons and courses.

A revision test with about 10-20 questions to brush up what you have been learning would be nice. As I go, I'm bound to forget what I learnt at the very beginning (Recency principle), so a test that covers parts of what I have learnt to keep me brushed up would help me to keep hold of what I have learnt, and where I may have failed, the summary I get after every answer can help me regain and retain that information.