<p>My sister is 6 years younger than me. I usually buy current editions of all AP/SAT review books. Will she be able to use them in 4-6 years or should I just sell them?</p>
<p>might as well. theyre good unless the test changes significantly (like it did in getting rid of analogies, adding a writing section, etc). I used four-year-old SAT review books and scored 2300+ so it won’t necessarily hinder her.</p>