What you need: Bic Mechanical Pencils, $5; Printer

Risk level: Low 

There are plenty of ways you can sneak a cheat sheet into your exam (there are more on this list); one of the best is in a mechanical pencil. After you type up your miniature cheat sheet, grab a non-see-through mechanical pencil that takes 0.7mm lead or thicker, remove the eraser, remove all but one of the pieces of lead, roll up the cheat sheet and stuff it in the barrel. During the test, when the one piece of lead runs out, act like you’re putting more in and take a peek at your cheat sheet. Discretely, of course.