The trouble with tests

Right now I feel so frustrated. I just took a calculus test and I'm pretty sure I failed. I know exactly what I did wrong on the test and all I can think about is how I wanna go back and fix my mistakes. I can't concentrate on anything else. Have you ever had that feel when you sit down to take a test? That the right way to do a math problem is right there in your head but for the life of you, you can't remember it? And after you turn in the test, you suddenly realize how to do the problem? And all you can concentrate on is that? And you feel helpless because there's nothing you can do about because you're teacher wouldn't listen anyway? That's how I feel right now. I feel like crying. And I REALLY feel like throwing something. Something heavy. Anything to make me feel better.