Rubber Method

Note: Only works with thick rubbers.

1. Before the test (at home, for example), take a rubber, and use a long, thin object (rulers work well) to saw through the middle of the rubber (the width, not length). Don't go so far as to snap it in half. Gently bend the rubber so that the middle is revealed. Write notes or anything else in the middle, and let the rubber go back to its normal position. During the test, simply take the rubber out of your pencil case, bend it in half (pretend to be fiddling about), memorize the notes, and write them down.