What you need: MWE Spy Earpiece, $240

Risk level: Low

Get your Mission Impossible on with this discrete method of cheating. There are a number of companies that make tiny earpieces, but only a few of them can work with such a wide array of applications. Connect the MWE Spy earpiece to your phone via Bluetooth and have your friends feed you facts. Or you can go a little safer with the MP3 version which lets you listen to audio files thanks to a transmitter that plugs into your audio player. It’s pricey, yes—but if you really need to pass an exam, this is one of your best, most fool-proof bets.