Give the GLAT a try
Google has posted the Google Labs Aptitude Test (GLAT) on their blog. It is four pages and contains only 21 questions. Unfortunately, the questions are like this:

"'Tis known in refined company, that choosing K things out of N can be done in ways as many as choosing N minus K from N:I pick K, you the remaining.

Find through a cooler bijection, where you show a knack uncanny, of making your choices show all K of mine. Oh, for pedantry: let K be no more than half N."

I'm gonna skip the test; however, you can knock yourself out.