Lanyard Method

If you have any type of lanyard and know you have a test coming up a little more in advance (like three days or so) start wearing a lanyard to school like it's something you want to start wearing. Make sure there are a few solid things on there that could eventually cover a slip of paper. The day before the test, write some notes on a slip of paper that can be blocked by the other things on the lanyard. Then, add it to the lanyard in between a few things. Since it's thin, it's likely no one will notice it being there. During the test, when you need an answer, start playing with it and peek at your notes. Don't do this very often during the test, and if you sit in the front of the classroom, you may need to ask to go to the bathroom to look over them. When you're done, flush the piece of paper down the toilet to destroy any evidence. For good measure, you might want to continue wearing the lanyard afterward, and you can keep using it for tests.