<p>I too think prep courses are a waste of money. Mostly because they try to teach you everything. you do not want to waste time studing materials you already know. I took a prep course for the SAT that cost $700 and found it useless. My score did not increase at all. However, if you hve the money, private tutors can be a worthwhile investment. They go at your pace and help you on areas you struggle with it. However, if you have engouh dedication and time, you only need review books to do well.</p>