I may have posted about the LaTeX exam documentclass in the past. But, again, here is some useful information for that documentclass. Exam.cls allows us to implement a nice clean testing format which makes allowances multiple choice, parts, answer keys, and other very nice options.
Perhaps some of the most useful documentation I’ve seen on the exam.cls is at http://www-math.mit.edu/~psh/exam/examdoc.pdf. This .pdf document is clear, concise, and contains almost all of the information which I find useful for exam.cls.
I hope this document is a help to everyone out there.