<p>Well, I think you really need to go over the SAT2 prepare books and that's quite enough. When I began to prepare for SAT2 tests, I was very upset. Because I learn everything in Chinese, and I don't know much Physics vocabulary. But since I do physics well in school, I finished the Kaplan book in a few days and went to Barron's for detailed preparation(but it turns out to be helpless). I have no idea what is American Physics textbook like, but I think the prepartion books really focus on what will appear in SAT2s.
For math part, I think Barron's is not useful. again, it depends on your math skills. Most Chinese never work on Math for SAT2 but still get 800.
I hope it can be helpful. Since I am a Chinese and we learn different course in school. I just come back from middle of my SAT vocabulary and will go back to the painstaking work again.
Good Luck!</p>