The GRE quantitative section is not a math test; it's a reasoning test that uses undergraduate-level math. Here's the algebra you need.

The math itself is not advanced. It's mostly high school level algebra and geometry.

The difficulty comes from the tricky wording and the need for clever, efficient problem-solving.

You must have 100% mastery of: linear equations, inequalities, and systems of equations.

You need to be an expert in word problems—translating a story into a mathematical setup.

Exponents and roots are very common. Know all the rules and how to manipulate them.

Functions and function notation are fair game. You should be able to interpret f(x) and understand domain/range.

The GRE loves to test number properties. Understand the rules for integers, odd/even numbers, and primes.

There is no trigonometry or calculus.

The key to the GRE is not learning more advanced math, but becoming incredibly skilled at quickly solving problems with the math you already know.