I can't concentrate and it's doing my head in...?

I had the exact same problem with my exams which just finished last week. I always found some way of getting distracted. But, in the end, I got my friends around and we all revised together. We locked ourselves in my room so we couldn't get out, and in the end up, we HAD to revise! It made it a lot more interesting too, hearing other people's way of learning to help you learn.