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The Graduate Record Examinations (GRE) is a standardized test that is an admissions requirement for many graduate schools in the United States,in other English-speaking countries and for English-taught graduate and business programs world-wide. The GRE General Test is offered as a computer-based, computer adaptive exam administered by selected qualified testing centers; however, paper-based exams are offered in areas of the world where computer-based testing is not available.

• Quantitative Reasoning — Measures problem-solving ability, focusing on basic concepts of arithmetic, algebra, geometry and data analysis. The quantitative section, the other multiple-choice section, consists of problem solving and quantitative comparison questions that test high-school level mathematics. Multiple-choice response sections are graded on a scale of 200-800, in 10-point increments. In a typical examination, this section may consist of 28 questions, and test takers may be given 45 minutes to complete the section. This section typically includes 14 quantitative comparison questions, 10 discrete quantitative questions (multiple-choice) and 4 data interpretation questions

source: http://www.ets.org/gre and http://en.wikipedia.org/wiki

The Graduate Management Admission Test GMAT is a computer-adaptive standardized test in mathematics and the English language for measuring aptitude to succeed academically in graduate business studies. Business schools use the test as a criterion for admission into graduate business administration programs (e.g. MBA, Master of Accountancy, etc.) principally in the United States, but also in other English-speaking countries. It is delivered via computer at various locations around the world. In those international locations where an extensive network of computers has not yet been established, the GMAT is offered either at temporary computer-based testing centers on a limited schedule or as a paper-based test (given once or twice a year) at local testing centers.

source: http://en.wikipedia.org/wiki