GRE General Test
The GRE® General Test measures verbal reasoning, quantitative reasoning, and critical thinking and analytical writing skills that have been acquired over a long period of time and that are not related to any specific field of study.
GRE Subject Test
The GRE® Subject Tests gauge undergraduate achievement in eight specific fields of study and is often required for admission into a master's degree program.
More information and registration: http://www.ets.org/gre