Hi Ben,

It appears that basic math, geometry, algebra, and graphs and functions are the four main areas of math on the GED. I would recommend looking over these courses to see what you may need to review:

The arithmetic course: https://www.khanacademy.org/math/arithmetic-home

Algebra courses: https://www.khanacademy.org/math/algebra-home

Geometry content: https://www.khanacademy.org/math/geometry-home

The statistics and probability course: https://www.khanacademy.org/math/statistics-probability

This article may also be helpful in knowing what math will be on the GED: https://ged.com/blog/what-kind-of-math-is-on-the-ged/

I hope this helps! 

Thanks, Allison