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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.
For example, she took the masters in technology management but because of the fellowship she did had the opportunity to take her PhD in civil engineering with a full ride. To get into grad school, you need to take the GRE and will need whatever prerequisites in your undergrad degree the school requests.