<p>Are the older edition study guides (eg. a 2nd edition from 2000 vs a 5th edition from 2010) significantly worse for AP exam preparation? Or is it just Barron/Princeton Review etc 's marketing tactict to get us to buy new study guides rather than used ones?</p>
<p>It’s OK to get an older edition. Most of the time, “newer” editions of a book simply have a redesigned cover.</p>