The best known test, the Graduate Record Exam or GRE, is similar to the SAT. There are two types of GRE testing. The first part is often called the general section and is intended to measure aptitude. The other section, a separate test, is often called the subject test and can be in any of a dozen or so subjects including economics, biology, psychology, etc. More on the subject tests will follow. You will find most schools require that you take at least the general exam. Many will ask for both. Check gre.org and GRE Bulletin for registration forms, deadlines, times, locations and other important information.
Some graduate programs will require that you take the Miller Analogies Test or MAT. This consists of 100 analogies arranged in increasing difficulty. Typically, schools require you to take tests no later than the October or December dates for admission the following fall. Later dates will fall after most application deadlines. Check Petersons and the schools Web site to see which tests are required for each program.
It would be helpful to have your scores before you make your final selection of schools so you will have a better idea of your chances for admission.
Students whose native language is not English may be required to take the Test of English as a Foreign Language (TOEFL) or the Test of Standard English (TSE). Informational booklets and applications are available in the CRC.