Hi, I just saw your answer on that thread. I agree with you that prep courses seem unnecessary, as usually, the general course of study is supposed to prepare you for the next class. That being said, I also think that some students worry about future classes, especially when they feel unprepared. I’ve never used outside resources myself to prepare for a class, but I also feel like I’m not that kind of learner. With regards to tests, I think test prep is valid because tests are different than just learning content. Many tests are structured in a way that places more value on studying the test itself, rather than the information you’ve learned. AP Exams in particular are not the best test of subject knowledge as a whole. With some exams, it is the way you phrase your answer or structure your essay that gives you point. I definitely see where you’re coming from, though.