What you need: Printer, Adobe Photoshop (or image editing software), laminator 

Risk level: Medium

When teachers tell you not to bring anything to a test, the one thing you can usually tote along is a book for you to read in the event you finish early. Take advantage of this opportunity by making a custom bookmark with your cheat sheet printed on some part of it. We recommend putting a bold design on one side, and the information you need on the other. You want to make it look like a real bookmark, so if you can get access to a laminator, the better off you’ll be. Don’t make it too large: 1-inch wide and five inches long is a good size. While you’re taking your test, slide it out and glean as much as you can.