Just exhausted

I have a feeling that I am not able to do anything except dreanking coffee and chatting with friends. I am really exhausted after my today exam of Evolution of international systems in the period of 1789-1945. It was really tricky, I guess our teacher decided to take revanch after all. But it doesn't make it better... Well, I hope my grade will be better than I expect it to be:D LOL!