Go to www.byu.edu, do a search on "Principles of Test Creation" and get the PDF handbook you'll find.
It is divided by kind of test question and has basic guidelines, practice questions to evaluate and a helpful answer key for each section.
Trust me -- if you've wondered if your exams really are fair, you can use this info to revise your tests. The author did an excellent seminar at the touchy feely conference this year.
You can thank me later -- and you will :).