This sickness is something that everyone experiences. The Pre-Exam Syndrome. For me though, it ain't that serious. Some people are so seriously ill, that they break into cold sweat when they hear the word "exam", or break down and cry when they find out that their peers are doing much better than them in their revision.
For me, I can't be bothered. Haha.
Relax. That's all I can say to those who are in the above categories that I just mentioned. Don't stress yourself, otherwise nothing will go into your head. Be like me. I don't memorise things, I understand things. This way, you can gain enlightenment and also the distinctions.