schools in the United States and Canada. Purpose: Admissions to master's and doctoral degree programs in various universities Knowledge / skills tested: Analytical writing, quantitative reasoning and verbal reasoning. GRE is one of the most popular exams for graduate applicants seeking a masters or doctoral degree such as an MS, MBA, JD, or Ph.D. In addition to the General Test, there are also six GRE Subject Tests testing knowledge in the specific areas of Biology, Chemistry, Literature in English, Mathematics, Physics, and Psychology. The length of each exam is 170 minutes.