As you have asked about the Graduate Record Examination (GRE), I am giving you information about it, check below for the details

It is a standardized examination.
It is an admissions requirement for most graduate schools

It tests three sections:
Verbal Reasoning,
Quantitative Reasoning
Analytical Writing

Score / grade range

Analytical writing: 0.0 to 6.0 (in 0.5 point increments),
Verbal reasoning: 130 to 170 (in 1 point increments),
Quantitative reasoning: 130 to 170 (in 1 point increments).

Duration
About 3 hours and 45 minutes
(includes 1-minute breaks after each section and a 10-minute break after third section).