Format and Timing
The GMAT exam consists of three main parts, the Analytical Writing Assessment, the Quantitative section, and the Verbal section.

Analytical Writing Assessment
The GMAT exam begins with the Analytical Writing Assessment (AWA). The AWA consists of two separate writing tasks-Analysis of an Issue and Analysis of an Argument. You are allowed 30 minutes to complete each one.

Quantitative Section
Following an optional ten-minute break, you begin the Quantitative Section of the GMAT exam. This section contains 37 multiple-choice questions of two question types-Data Sufficiency and Problem Solving. You will be allowed a maximum of 75 minutes to complete the entire section.

Verbal Section
After a second optional ten-minute break, you begin the Verbal Section of the GMAT exam. This section contains 41 multiple choice questions of three question types-Reading Comprehension, Critical Reasoning, and Sentence Correction. You are allowed a maximum of 75 minutes to complete the entire section.

CAT Format
A computer adaptive test (CAT) is very different than usual test. On a CAT, the computer will select which questions according to your proficiency. If you keep getting questions right, the test will get harder and harder; if you make some mistakes, the computer will adjust and start giving you easier problems.

GRE
Graduates planning to pursue a Masters (M.S) or Doctoral program (Ph.D.) in American Universities are required to take the GRE, conducted by Educational Testing Service (ETS), Princeton, New Jersey. GRE is a Computer Adaptive Test (CAT). GRE is scored on a maximum of 1600 points. Analytical writing scores are given separately on a scale ranging from 0-6.Remember, the scores are very important for students for getting the admissions or scholarships.

GRE
General Test The GRE General Test is designed to test fundamental verbal, mathematical, and logical skills that the average student is expected to assimilate in the course of his or her college education. The vast majority of graduate programs require that prospective students submit GRE scores in order to be considered for admission.
The VERBAL sections mainly test your vocabulary and reading comprehension. The ANALYTICAL WRITING, tests a person's ability to express his thoughts clearly & logically on the paper.
The following chart shows how the scored versions of the GRE are organized.

Paper -and-Pencil Test CAT
Quantitative Two Sections
One Section (Math) 30 minutes/section 45 minutes 30 questions/section 28 questions
Verbal Two Sections One Section
30 minutes/section 30 minutes 38 questions/section 30questions Analytical Writing One Section 2 Topics 75 minutes

In addition to the scored sections shown in the chart, both versions of the GRE contain one unscored experimental section containing trial questions for future use. And the CAT also includes an optional, unscored research section.

The CAT (Computer Adaptive Test) Format
The computerized version of the GRE is very different structurally from the traditional paper-and-pencil test. On the CAT, the computer will select questions for you based on how well you are doing. If you keep getting questions right, the test will get harder and harder; if you make some mistakes, the computer will adjust and start giving you easier problems. If you answer the easier problems correctly, the computer will give you harder questions again.

GRE Subject Test
The GRE Subject Tests are more specialized exams that test knowledge of specific subject areas (i.e. psychology, biology, etc.). Unlike the GRE General Test, which assesses skills that have been developed over a long period of time and are not related to a particular subject area, Subject Tests evaluate knowledge of a particular field of study. They enable admissions officers to compare students from different colleges with different standards and curriculae. The Subject Tests are offered in the paper-and-pencil version only.
There are sixteen Subject Tests: