There a few things that you need to consider before you make your decision. To get started you need to look at your three PSAT scores (critical reading, math and writing) and your Selection Index (SI), which is the sum of all three PSAT sections. You then take your SI and add a zero to the end to make it four digits.
The general rule is that if your total PSAT score is below 1500 and your math score is strong, then you will want to take the ACT. If your total PSAT score is over 1500 and your score in language arts is strong, then you would prepare to take the SAT.
There are some exceptions, though. Let’s say your total PSAT score is below 1500, but your math score is low, then you may want to look into taking the SAT. If your total PSAT score is over 1500, but your critical reading score is low, then you may want to consider taking the ACT.
Most will agree that the ACT is generally easier overall. It is also usually recommended for those students who suffer from testing anxiety. It is important to note that you are not penalized for wrong answers or guessing when taking the ACT test.
Besides looking at your academic strengths, you will also want to consider college preferences. If a school on your list prefers one test over the other by accepting an extremely low score on one test versus the other test then it’s essential for you to focus your efforts accordingly. If you haven’t narrowed your college search, then you’ll want to focus on the test that will allow you to excel most & accentuate your skills.