What do you do if you CAN'T study anymore?

Well, it is that time of the year. I have already written 2 exams and I have one more exam. I have done well so far in that class, but I am not given that much time to study for the final. I am having difficulties with getting myself to continue studying. I have been looking at it all day, but it doesn't seem like anything is going in anymore. My exam is tomorrow, I don't have time to be lazy, but I just can't study anymore. Do you have any ideas of how to get myself studying again? I went for a walk and everything, but I still don't want to study. I am sooo tired and it is too much to learn.
What do you do if you CAN'T study anymore?
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