The GRE is short for graduate record examination, a common test required to get into graduate school. It is a test on student's ability to reason and make logical conclusions. There is also a section on mathematics, but at a high school level, which tests mathematical knowledge as well as logic as math is logic. There are also additional options available for biology, chemistry, physics, and other subjects for certain graduate programs of these subjects or similar programs. The GRE is not the only thing graduate schools consider for admission, but it also has a lot of clout when it comes to getting into grad school.