<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>