<p>I borrowed an unused copy of the Barrons book for Math 2 and the PR Physics book from a friend. Will they suffice or should I also buy
1. Only the CB book for ALL subject tests OR
2. Only the CB book for Maths 1 and 2 OR
3. Both CB books for Maths 1 and 2 AND all subject tests?
The CB books are pretty expensive, and since I am only giving Phy and Maths 2, do you think they're worth it?
Thanks.</p>