Find what you need in our searchable FAQ.
Some professors provide old tests for studying purposes on Course Reserves. Listings can be found at: http://www.lib.iastate.edu/courses-startform/6176 .
The ISU Library also subscribes to Learning Express Library (linked from the Article Indexes and Databases list) which provides a large selection of study guides and practice tests, for example: TOEFL, GRE, GMAT, SAT, LSAT, GED. When the page loads, type the test name into the search box.
If you want a printed book - a few graduate entrance exam study guides for GRE and GMAT are available in the collection - check Quick Search by keyword to locate them, but more current ones are often available in university bookstores.