<p>I plan on taking the US History, Physics, and Math II SAT Subject Tests June 6 [shortly after my AP US, AP Physics B, and Pre-Cal finals].</p>
<p>For US History, I planned on getting a copy of the AMSCO book and my old notes for both tests, but my older sister has a copy of a 2004-2005 Princeton Review one. Anything that would somehow make this outdated/a bad bet?</p>
<p>For AP Physics B, I haven't decided on much beyond using my old school tests - I know the AP test and Subject test have some different material, so I'm not sure if I want to buy an AP or Subject Test prep book - advice here?</p>
<p>And I'm taking Math II. I've been doing pretty well in Pre-Cal, managed to understand everything so far, but I want to get a book to be on the safe side. Thing is, my sister [again] has a 2004-2005 Kaplan Math IC and Math IIC prep book. So [again] is there anything that would make this book outdated?</p>
<p>For some more information, it's not that the books are prohibitively expensive or anything; just that my parents don't see any reason to buy new ones if the old ones work.</p>