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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.
Many graduate schools in the United States require GRE results as part of the admissions process. The GRE is a standardized test intended to measure the abilities of all graduates in tasks of general academic nature, regardless of their fields of specialization.