Don't copy. Simple as that, you won't get anywhere in school if you cheat.
However I have used some nice tricks.
1. You know those stupid plastic water bottles? Take off the advertisement on it (the paper around it) and write all the answers around it, and then if you need some answers pretend you're getting a drink. 2. If you are a tiny small writer, use your fingernail. 3. This isn't mine, but if you're a girl write them inside you're t-shirt, or inside your coat or whatever, if you're teacher is seen looking down at that he would be fired. 4. Get a piece of paper & scrunch it up, then right the answers on the ball, but not to many or it looks like you've cheated, put it somewhere like on the floor, or in a bin, just somewhere you can see it but the teacher won't. 5. Bring your phone in to school, hide it somewhere like a pencil case like Infinite said.