After taking an exam, how does one put their mind to rest and calm down about possible errors they made? I took a quantum exam and made two errors that I realized after leaving, one was an algebraic error (We had to solve for the integral of x^3*e^(-ax) from 0 to infinity. Turns out there was a shortcut using substitution that I didn't think about) and the other was a silly graph error that will probably mark me down a bit. Now, I finished every question and I feel confident that I conceptually understood each question and will get high marks besides these mistakes. However, I have an inner demon called Worrying that makes me feel as if my performance was sub par. I know there will be a curve considering a good portion of the class didn't even complete all the questions. Usually the highest scores are in the 80s, so I feel I will be somewhere around there. How does one stop worrying about their performance on an exam? I'm naturally a perfectionist which doesn't help in a field where the average test score for an exam is in the 50s and 60s.