Maintains online practice tests, exercises, skill-building courses, and e-books for the GMAT, GRE, LSAT, and MCAT.  Each current PSU user must create an individual account.

Includes information on commercially published tests and instruments, and also,  full text, research reviews of tests.

The nonprofit ETS collects tests and other measurement devices that makes information on standardized tests and research instruments from the early 1900s to the present.