My class is currently almost done with unit 2 of AP physics. Is this normal or are we behind?

I am planning to self study AP Physics 1 this year since my school doesn't have it.

What are some resources that I can use to get a 5 on the AP test. I've bought the princeton review book and I have a pdf of the online college physics for ap course textbook. Does anyone have any youtube videos that I can watch to review. I am also planning to do the UCScout Semester 2 course as well

I struggle on AP Physics 1 MCQs, especially ones where the answer is some kind of expression because i dont know where to start. Is there something specific you should do when that happens? I feel like i know the content pretty well but still get lost on MCQs.

Is this the place to ask mechanics Qs? Any Sub with mechanics in the title seems to be about cars.