studying for exams

does anyone knows how to stick myself to the chair and study SERIOUSLY for my exam?? It seems like my mind and patience are active only when I enter in the safe/crisis period of time prior the exam… Then my virtue is indeed praised.

I am staying on the chair half an hour then I have to take something to drink, than another 10 minutes and I have to pee, than after 5 minutes, in which ive thought what should I start focus on, I am changing the music…
Finally I realize I am feeling sleepy and I hope that if I am going to sleep, not much just 15 20 minutes, then when I will wake up I will have the most outstanding power to sit on the chair and learn…

In the end all reduces to a couple of nights with no sleep at all and a possible cold - damit is so cold in my room that i have to put a planket on me although the heat is turn on! In the end i will get a cold.. - well as long as the exam is taken that is fine :)

And to those that had problems with "spy sherif" virus, i have some bad news, the virus is not that easy to clean.. another virus got stuck in my PC after is called i386p.sys .. I am not sure what is doing and the removal procedures sound so complicated.. that i guess i will need a full day. good thing that there are such things like google.. and other charitable souls that post their experiences on the net :)