Haha, I'm the first/only one who voted. Caffeine affects different people differently. I don't think it really has any effect on me, just the smell of it though helps me focus. I'm one of those people who sip on coffee over the entire day although it has turned room temp bc it's not so much the caffeine but the smell/taste that gives me energy. Others drink the entire thing as quickly as possible for the immediate jolt. It puts some of my friends to sleep on the other end of the spectrum. You probably know how coffee affects you before exams. I probably wouldn't drink it before as it can make you more nervous, but I would drink some during when you feel an energy dip. Once you get over the fact that you're taking the real test, you'll feel no more anxiety (if you prepared with enough practice exams, real testing conditions, etc)