<p>Jolynne--</p>
<p>Register on-line at the collegeboard website <a href="http://www.collegeboard.com%5B/url%5D">www.collegeboard.com</a>. </p>
<p>Definitely take it right after pre-calc. My son took it in June of soph year after pre-calc before he forgot everything in calculus. Oh, and the Math IIc would probably be most appropriate if he has had precalc.</p>