I've taken freshman physics I and II about a year ago (I don't remember too much from it..) and I was wondering how important they are to the junior year classical mechanics? I've noticed that a lot of learning resources online for physics starts at the junior year classical mechanics and it almost seems like they're reteaching the earlier physics in a more rigorous way. Is freshman mechanics just there to introduce people to basic concepts and improve their problem solving mindset? Or is it actually an absolute prerequisite for the junior level mechanics? I'm trying to decide if I should bother going back and relearning freshman mechanics before trying out the higher level mechanics. I have calc 1,2,3, differential equations and linear algebra so as far as I know I'm fine when it comes to the math.