Test Preparation Guides?

Hey all,

I’ll be doing three SAT tests this January. However, I’d like to now more about the Study Guides printed by some publishers. I’ll be doing Chemisty, Physics, and Math Level 2 tests this January, and AP Calculus BC next June.

I am considering the Princeton Review “Cracking the SATII tests” and “Cracking the AP tests” Series for now, but I’d like to hear responses about which ones are comprehensive and which are not… I’ve heared that Barron’s test preparation guides were good too…