Review books updated annually?

<p>Hi,</p>

<p>I was wondering: are review books updated annually? For instance, would Princeton Review release a 2007-2008 edition SAT II US History when there's a 2006-2007 version? If so, when do the test prep companies release the latest editions? If we're planning to study mostly over the summer, is it worth the wait, or should we just get this year's 2006-2007 version?</p>

<p>Thanks.</p>

<p>I don't know how often they update the books, but it's really very little difference. Don't bother trying to get the newest edition. I looked at PR SAT II Chem 2005-2006 edition and 2007-2008 edition, and (aside from a different cover), they seemed virtually indistinguishable.</p>