What is the best prep book for Math Level 2?

I can only get one.

Go for princeton review. Barrons is excessively hard. Doctor Chung is ok, but it doesn’t explain everything. However, it has a lot of practice tests. If you can get 2, add this one.

If you have a graphing calculator and plan to use it, then Barron’s would suit you fine.

If you’re looking to learn the material from almost scratch go with barrons. Mcgrawhill if you’re looking for really accurate tests.
dr chung if you want to refine your knowledge.