The cover-up
This method is one of our favorites. You can even use it if your school has a uniform. No one will tell you that you can’t use bracelets at school. They will also help you look more fashionable. But you may be asking how you could use them to pass a test.
You can plainly write the information you need on your arm; you already have the bracelet to cover them up. During the exam, you can just scratch your arm and move the bracelet around until you find what you are looking for. Just make sure that you commit to using the bracelet for the rest of the school year.