Digital SAT prep different levels (foundation, medium, advanced)

Good day, I am a khan academy student for the past few months. I am doing the SAT course . I noticed that all the articles and videos in all levels of SAT (foundation, medium, and advanced) are the same . So i just want to know if we are supposed to go through those repeated parts again or just do the test practice questions ,quiz and unit tests of the respective lesson/chapter You are help and immediate response is highly appreciated