Beside the instructable i shared with you the video version of this how-to / instructable , witch will make it more easy to understand and more entertaining !
You will need only a bottle of water, and access to a printer , the method is not well known but the efficiency is incredible !
Step 1: Step 1 - Cheat Sheet
Well i recommend that you print your sheet with "Times New Roman" on a small font size 6 or 7 depending on how it's more comfortable for your view ! you could hand write your sheet but it's way harder to understand printing is the best option !
Make sure your cheat sheet dose not exceed "5cm height and 10 width" .