Restless Nature

I ama 21 year old college student from western India staying in Hostel. I would like to know a remedy for my extremely restless nature which intervenes with my studies.I am otherwise a cheerful and jovial person and physically fit accept for 1 or 2 boils that i used to get frequently in any part of my body but nothing since last one year. Though i do have some skin rash on my stomach for almost about 2 years. To explian my problem--I will give you one example: During a class test after I finished my paper I noticed that the boy sitting next did a question wrongly. Since it was an examination I could not tell him that his answer id wrong. For quite sometime I was disturbed that had I told him the right answer he would have scored well. I also thought that if he comes to know that I knowingly didnt tell him that he was wrong, he would think bad of me. This was one example. This happens more frequently during examinations and i loose concentration for hours together. My sleep is also very light and i wake up on slightest sound but when I am at home during vacations I sleep like a log. Kindly suggest remedy. Thanks