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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.
How the GRE Works. The GRE is a three-hour exam, comprised of three sections that measure the test taker's readiness for graduate school. In the analytical writing section, the first part of the exam, students have 45 minutes to answer one of two essay questions on an issue and 30 minutes to write an essay critiquing an argument on the given topic.