Are SAT II Prep Guides worth it?

<p>Hello! I'm a rising junior and I am thinking about taking a few SAT subject tests. I already took US History (680, DEFINITELY retaking that) and I didn't study for it at all. However, I DID study for the APUSH exam with the Princeton Review book and used the material I learned from it on the subject test. My question is, do you think I should get some prep books for the following tests I'm taking?
Literature (I will be in AP Language and Composition next year. However, I have the Princeton Review AP book for Literature and am getting the latest version of Language)
Biology E/M (I will be in AP Biology next year, I have the AP Biology PR book already)
Math 1 or 2 (I think I am going to take two, next year I will be in Accelerated Algebra two with Trig. and I like math a lot)
Chemistry
Physics
and US History
Any thoughts and/or opinions are greatly appreciated!!!</p>

<p>According to many, Barrons is the way to go for Math 1 and 2. Princeton review for Physics. US History, you can use larry kriegers new book or even the AMSCO book. Chemistry, I dont know, I just used my AP chem knowledge on that one.</p>

<p>So I take it they are worth the buy, eh?
I was looking at the College Board book of Math 1 and 2
and Princeton Review for the rest.</p>

<p>I would say the Barron’s Math Level 1 and 2 is worth the buy, because it really does give you ALL the information needed and gives you harder tests so the real test is a breeze. Whether the others are worth it, I do not know. I am generally not in favor of prep books as I feel that it deprives to student of invaluable information inside the classroom.</p>