Note: The only "official" test preparation materials are those produced by the testing company.
These resources represent a small sample of the many books and online test preparation resources available through the MSU Libraries. To find other test preparation materials at the MSU Libraries, a good strategy is to search for the name of the test you are interested in along with a term like "examinations" or "study guides" in the library catalog. For example, a keyword search for "GRE and study guides" will find many useful materials.
Sample subject headings for test preparation materials in the library catalog include, "Nursing -- Examinations, questions, etc." or "Vocabulary tests -- Study guides." Once you've found one good book for your needs, try clicking on the subject headings to find more resources on a particular topic.