<p>Keep in mind that the math percentile is based on kids taking the test who did better than you, not your actual score. So a 78% was probably, scorewise, very good–my kid was in the mid-80’s with a 750, which means he didn’t miss much. So most of you scoring in the 70’s or above are actually probably doing quite well on the test–there are just lots of kids applying to prep school who have taken advanced math and who missed maybe 1 or 2 fewer questions than you did.</p>