The short answer: not much! A major difference between the two tests is in their scoring. The ISEE does not penalize for incorrect answers, whereas the SSAT deducts ¼ point from a student’s raw score for incorrect answers. The ISEE gives you two scaled scores for math out of four total scaled scores), while the SSAT gives you one math score out of three total scaled scores. Some high schools strongly prefer one test (usually the SSAT), but the vast majority of schools will accept scores from either test.