Follow the link http://www.act.org/aap/concordance/pdf/reference.pdf to help you quickly determine which test is best for you. If the scores are almost identical, choose the test you prefer. There are big differences in the content and the strategy.
If your school only provides the PSAT, then take a practice ACT on your own at www.number2.com or purchase a test prep book. It is very important that you simulate testing conditions when you take the tests at home. That means timing each section and taking the test in one sitting, not spread out over the weekend.
If you were not pleased with your practice tests and those scores don’t match up with the colleges where you’d like to apply, then it is probably a good idea to buckle down and do some test prep.
by Lee Bierer. Read more at http://www.collegeadmissionsstrategies.com/2012/01/developing-your-testing-strategy/
