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Some schools may also require you to take one or more GRE Subject Tests. The purpose of each GRE examination, of course, is to help graduate schools decide if you've got the right stuff for their program. If you're looking for help with the exam, check out Peterson's full-length GRE practice test.
Do I need to take the Graduate Record Exam (GRE)? If you are applying to the Criminal Justice masters program and your overall undergraduate GPA is 3.2 or higher (or you have already completed a graduate degree), you do not need to submit GRE scores. If you are applying to the Forensic Science masters program or Criminal Justice doctoral program, you must submit GRE general exam scores.