The Graduate Management Admission Test (GMAT) is used by many business schools for admission into MBA programs. Check with the schools you are applying to in order to see if they require the GMAT or the GRE, another graduate admissions test.
This LibGuide has information about many of the examinations that are required for admission into graduate school. Hover over "Graduate School" for more information on the GRE and the MCAT.
The Princeton Review's Graduate School Search can help you narrow down your options and choose the best schools to apply for.
Gale's Testing and Education Reference Center has information on graduate schools school and scholarship opportunities for a variety of different programs.