GMAT is Graduate Management Admission Test conducted by English Testing Service (ETS).
A perquisite test for admission to Graduate Management Schools in USA
GMAT is Computer Adaptive Test (CAT) in which each question is chosen based on whether you answer the previous question correctly.
GMAT measures the skills of student in three sections.
Analytical Writing Assessment
Test Format:
Analytical Writing 60 min
Optimal rest break 5 min
Quantitative 37 questions 75 min
Optimal rest break 5 min
Verbal 41 questions - 75 min
Total Time 4 hours (approx.)
Analytical Writing Assessment:
The AWA consists of two 30 minute writing tasks - Analysis of an Issue and Analysis of an Argument.
The AWA is designed as a direct measure of your ability to think critically and to communicate your ideas. More specifically, the Analysis of an Issue task tests your ability to explore the complexities of an issue or opinion.
The Analysis of an Argument task tests your ability to formulate an appropriate and constructive critique of a specific conclusion based upon a specific line of thinking.
The graduate schools can on the basis of the Analytical Writing Essays differentiate among candidates who present otherwise similar credentials.
Quantitative Section
Test Basic math skills, understanding Math concepts and reasoning skills
Type of questions include
Problem Solving
Data Sufficiency
 Verbal Section
Verbal Skills are fundamental building blocks of a academic success.
Verbal questions are designed to fast how well you understand the written word. Your ability to read carefully and to think about what you read is crucial to your success in college.
There are three types of multiple choice questions
Reading Comprehension
Critical Reasoning
Sentence Completion
The score is valid for 5 years.
Total Scores of Verbal, Quantitative, AWA ranges from  
Quantitative, total
Total scores range from 200-800
The AWA score reported and scale of 0-6 with half point increments.