I see. Well don't force yourself out then. If you overworked yourself both in classes and exams, sooner or later you'll get collapse in who knows where though I highly doubt that. Judging from I read your message, I can see that you are a hard working student however as I said before, don't force yourself out. You're never know what happens if you overworked yourself out. Another thing, I don't know what kind of advice I should give it to you but should you have got yourself some free time from homeworks and stuff, I suggest you read some books that will interest you, going out with your friends or by yourself or see the view from your window or any high places. Or you can ignore my advice and do it your own way. Who knows? Maybe that will give you the motivation you'll need. This is the least I can do to help ya. Anyways, have a great day and if you have an upcoming exam, then do your best and break a leg.