After Credentials
I honestly don't think that 'cram schools' are particularly effective. I taught for the Princeton Review for a while ($20+/hr when I was 18 sounded pretty good). In my experience, the average student would only gain about an extra 50 points the SAT (relative to what they would have gained studying on their own). If memory serves, a standard deviation (on the old 1600 point test) was usually in the neighborhood of a 110 points.Increasing your score by less than half a standard deviation was nice, but it rarely made or broke your college application.