<p>What is the best book for AB? I used Barron's and 5 steps for A, but I want to know if these two are good for AB as well. I'm pretty confident that I only have to study 4 - 5 more topics because I got a 5 on A and I retained most of that knowledge.</p>
<p>I used Barron's for AB & got a 5.</p>
<p>Why take AB if you already took A?</p>
<p>AP Siemens Award really.</p>