exams

I could be wrong, but it sounds like you are taking some kind of class and are very stressed out right now. Exams let the teacher know that we are actually learning what she/he is trying to teach. It lets us and them monitor our progress. Some people are good at test and some people are not. Some people have a hard time studying for test, so they cram at the last minute and just kind of like throw it out on paper as soon as possible. I know that I get nervous/excited before taking a test, but I always feel good when I do a good job. When I don't, it lets me know what I need to work on.