University of Science and Arts of Oklahoma
The GRE Revised General Test measures skills that are not specific to any given field:
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Peterson's Practice Tests for the GRE Revised General Test offers practice tests to give you experience with the GRE's content and question-types You can explore and practice a total of almost 500 GRE-like questions and their detailed explanations during 90-days of online access. ($19.95 as of December 2018).
Practice Book for the Paper-Based GRE revised General Test
BestColleges.com's guide includes segments on the GRE from start to finish and helps you get from registration to test day to scores; common pitfalls students face and tips and tricks for each section of the test; and, comprehensive study resources for every budget.