GMAT is Graduate Management Aptitude Test.
It is a computer adaptive test.

This exam is for the admission to the MBA programs in many universities worldwide.
The GMAT scores are acknowledged by about 2200 business schools across the world and a good score is a criterion for admission to top international business schools like London Business School, Harvard and Stanford
As you have asked about the exam pattern for GMAT, see the details below

GMAT Test Section Number of Questions Timing
Analytical Writing Assessment 1 Topic 30 Minutes
Integrated Reasoning 12 Questions 30 Minutes
Quantitative 37 Questions 75 Minutes
Verbal 41 Questions 75 Minutes

Total Exam Time 3hrs, 30 minutes

The GMAT exam consists of three separately timed sections and it yields five scores:

1. Analytical writing score scaled from 0 to 6
2. Integrated Reasoning score scaled from 0 to 8
3. Verbal Ability score ranging from 0 to 60
4. Quantitative Ability score ranging from 0 to 60
5. Total GMAT® score ranging from 200 to 800