A memory aid is a tool that you can use to remind yourself of important information during a test or final exam. It is usually a piece of paper, and can contain facts, formulas and procedures that you learned in class and that you will use on the test. If you don’t really understand the class material, a memory aid will not be helpful, so make sure you actually understand everything you write on your aid.
The Moral: You need to understand the material in math regardless of the content on your memory aid.