If you have the money take the PRinceton Review Prep Course. My past experience says they are the best. If you don't have the money for the course get their test prep books and study dillegently. It gave a friend of mine 400 points on the PSAT/SAT.
If you have the money its actually stupid not to take the prep course. The one thing that should be a little reassuring is that they renormed the test a few years ago to give everyone an extra 150 points . . .
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