A classic way of cheating on a test is to have a cheat sheet with all the answers. But how can you have it with you during the test without your teacher noticing it? It would help if you thought of a good hiding spot that won’t raise any suspicions.
For example, you can conceal them inside a pen. Most ones can be screwed open and have enough space inside to fit at least one folded note inside. Just make sure to use an opaque pen, or your intentions will be as clear as the plastic pen.