When taking math tests, there are always lots of equations to remember. Some teachers allow cheat sheets on which you can write down various formulas and example problems. Others don't, and you have to rely on memorization. When this is the case, I recommend the following - First, memorize the equations during your study time by writing them out on scratch paper several times. Repeating them helps them sink in. Second, when you get the test, the first thing you should do is write down the equations/formulas on the top of your paper before you start solving problems. That way, you won't twist them around as you work other problems, or forget them during the test due to normal test anxiety.