What you need: Science Crib Sheet T-Shirt, $25; U.S. History Cheat Shirt, $20 

Risk level: High

This tip is neither high-tech or high fashion—but all geeky. Companies like Snorg Tees and Computer Gear have taken to making t-shirts scribbled with formulas, dates, and important terms you may come across during your scholastic career. The U.S. History Cheat Shirt has its text and diagrams printed upside down for easy reading. Your professor or teacher will have to be extremely dense to let this one slide, but it’s worth a shot. What are they going to do? Tell you to go home and change? Well, yes, they very well may.