Princeton Review Cracking the Physics subject test: Do versions change?

<p>Hey!</p>

<p>I had a quick question about the Princeton Review Cracking the Physics SAT Subject test book. I am planning on getting either the 2007-2008 or the 2009-2010. Did any of the info/tests change because the older version is much cheaper than the newest one?</p>

<p>Thanks!</p>

<p>I doubt the content of those books has changed much, if at all.</p>

<p>Thanks for the general info! Is anybody able to specifically comment on whether the practice tests differ or not?</p>