Reference : WIKIPEDIA

The Graduate Management Admission Test (GMAT (JEE-mat) is a computer adaptive test (CAT) intended to assess certain analytical, writing, quantitative, verbal, and reading skills in written English for use in admission to a graduate management program, such as an MBA program. It requires knowledge of certain specific grammar and knowledge of certain specific algebra, geometry, and arithmetic. According to the test owning company,

The Graduate Management Admission Council (GMAC), the GMAT assesses analytical writing and problem-solving abilities while also addressing data sufficiency, logic, and critical reasoning skills that it believes to be vital to real-world business and management success. It can be taken up to five times a year but no more than eight times total. Attempts must be at least 16 days apart.