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" .
Step 2: Cut the Sheet
Take a pair of scissors and start cutting out your sheet from the a4 paper .
Step 3: The Water Bottle !
Take a 0,5l bottle of water that has clear plastic and cut it's sticker from one side lose, just like shown in the picture, be careful don't take the sticker completely off !
Step 4: Duct Tape
Step 5: Back to the Bottle
Watch Pictures !
Then start to role the bottle's sticker back on the bottle !
Step 6: The Bottle
Make sure to duct tape only where the sticker is so no duct tape is visible on the bottle !
Step 7: Now Your Ready !
So if you liked this instructable you can watch the video of it 2 maybe get a better look at how it's done, anyway have fun , just don't forget to take your trusty water to school on that cursed day !