Stretching for the answers
Here is where your acting skills need to come into place. And if you have been taking drama lessons after school, you will have no problem. You just need to bring a rubber band to class a few days before the exam and play with it until someone notices it and acknowledges it.
When it is time to take the exam, you can write all the answers and keywords you need on it. Be sure to stretch it so you can write even more things on it, and when it collapses, it will look like you just scribbled on it while being nervous.