Most schools accept either test; however, be sure to inquire at the schools to which you are applying: each school will specify the test required for admission. Certainly, proclivities vary, so a student's aptitude for one or the other should be determined through diagnostic testing. A student should follow the path of least resistance, so if he or she shows a greater aptitude for ACT curriculum, then the program should target that test.
Although the SAT and ACT generally test the same skills, the reasoning required by each is slightly different. Although a diagnostic test is the best way to figure out which test you should take, following guide highlights a few important differences.
The SAT is an admissions test that measures critical reading, mathematical reasoning, and writing skills. Colleges and universities use the SAT as one measure among others—class rank, high school GPA, extracurricular activities, personal essays, and teacher recommendations—of a student's readiness to do college-level work.
The ACT is an achievement test that measures grammar, reading comprehension, mathematical, and science skills. Colleges and universities use the ACT as one measure among others—class rank, high school GPA, extracurricular activities, personal essays, and teacher recommendations—of a student's readiness to do college-level work. At many colleges and universities, the ACT is accepted by admissions officers in lieu of the SAT and the SAT Subject Tests.
The SSAT is used primarily by boarding schools such as Choate, Andover, and Exeter. The ISEE is used primarily by independent private schools such as The Francis W. Parker School in Chicago or Dalton and Trinity in New York City. Be sure to inquire at the schools to which you are applying: each school will specify the test required for admission.
The Secondary School Admissions Test (SSAT) is an admissions test for entrance into grades 5-12. Schools use the SSAT as one measure among others—class rank, GPA, extracurricular activities, personal essay, and teacher recommendations—of a student's readiness to do middle school or high school work.
The Independent School Entrance Examination (ISEE) is a 3-hour admissions test for entrance into grades 5-12. The ISEE consists of sections of verbal and quantitative reasoning, reading comprehension and mathematics achievement questions, and a timed essay written in response to an assigned topic.