<p>I just found a book on the subject and read that. Then get one of the review books and read that. Make sure you do the problems out so you dont just say, yea I could get that answer. Talk to your guidance counselour sp? and see if you can sign up through the school, or you might have to sign up through collegeboard. They want their money so I believe they will let you take the test regardless of what your school says. It is never to late, because you dont have to actually do any work for it. You shouldnt take a lab science independently, chem even physics and bio because you are suppose to have lab experience for some colleges.</p>