Scroll down this page, and you'll see "Are You Ready?/ Do You Need This?" -- That's the assessment. You could use the assessment to determine which book to buy, regardless of whether you sign up for the class.

http://www.artofproblemsolving.com/School/classlist.php#cd_prealgebra1

Last edited by syoblrig; 02/25/14 11:47 AM.