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GRE is a computer based test meant to measure your overall academic ability and is the standard exam for admission to non-business schools. However, an increasing number of business schools are accepting scores from the GRE exam.
The computer based test can be taken multiple times a year. The paper based test can be taken up to 3 times a year in October, November, and February.
The duration of the test is about 3 hours and 45 minutes (includes 1-minute breaks after each section and a 10-minute break after the third section).
Scores:
1. Analytical writing: 0.0 to 6.0 (in 0.5 point increments).
2. Verbal reasoning: 130 to 170 (in 1 point increments).
3. Quantitative reasoning: 130 to 170 (in 1 point increments).
Score / grade validity: 5 years.
For more details, you can refer to the below mentioned link:
https://www.ets.org/gre/revised_general/about/?WT.ac=grehome_greabout_b_150213

Master in Business Administration (MBA) is two years degree course in the field of management. In India MBA degree can be awarded by any recognised university or by a Business School affiliated to any university. Post Graduate Diploma in Management (PGDM) is a two years diploma course offered by the institutes that are recognised by the All India Council for Technical Education (AICTE) and which are autonomous and not affiliated to any university. It is not mandatory that a PGDM is equal to MBA. PGDM institutes accreditation by Association of Indian Universities (AIU) makes an institute's PGDM course equivalent to an MBA.
There are a large number of similarities between the curriculum of both MBA and PGDM. An MBA institute follows a fixed curriculum as it will be based on the university guidelines which occasionally may not be aligned to industry requirements. Autonomous institutes do not follow university standards, so it is have the flexibility to align its curriculum according to industry standards and change in the business environment. Some of the PGDM from IIMs, XLRI, etc. has more value than MBA. However, MBA of FMS DU, IIFT, etc. have similar value as IIMs. Students are advised to choose Institute based on its ranking not on nomenclature of degree.