High school classes

Hey so I’m starting high school next year and I’m supposed to have my classes chosen by February. I want to go to a nice college and be successful. Any classes I should take? They offer a class called AVID, which helps with getting you ready for college and teaches you important techniques to be successful and get good grades. Should I take it? I would have to write an essay to apply for that class, but I’m sure it would help me out. Any tips on just high school in general? I’m super nervous!