Graduate Management Admission Test (GMAT) is a test to assess certain analytical, writing, quantitative, verbal, and reading skills in written English that is used for admission to a graduate management program.

Math section in GMAT exam included to measure the ability of the candidates to make calculations correctly and to measure that candidate can learn high school mathematics or not.

Math topics included in GMAT exam :
Numbers
Real Numbers
Integers
Fractions
Decimals
Ratio & Proportion
Percentages
Roots & Powers
Sets
Statistics
Probability
Counting Methods
Algebraic Expressions
Linear Equations
Quadratic Equations
Exponents
Inequalities
Absolute Value
Functions
Lines
Angles
Triangles
Quadrilaterals
Circles
Polygons
Coordinate Geometry