Content of GRE

The GRE is a 3 hour 45min computer–adaptive test (CAT) that consists of three sections: an Analytical Writing Assessment, a Quantitative Section and a Verbal Section

More about the GRE Tests:
Analytical Writing	2 Essays, 60 minutes total 30 minutes for the "issue" essay 30 minutes for the "argument" essay Tests ability to communicate complex ideas in a concise and effective way, evaluate claims and evidence, support ideas using logical reasoning and relevant examples, and use standard written English to prove an argument
Quantitative	2 Sections: each section approximately 20 Questions 35 min Problem Solving, Quantitative Comparison, Numeric Entry (arithmetic, algebra, geometry, data interpretation)
Verbal	2 Sections: each section approximately 20 Questions 30 min Reading Comprehension, Text Completion, Sentence Equivalence Source: http://www.princetonreview.com/grad/gre-sections