study habits

I am a student at National University of Malaysia. I don’t like study too much. Normally, I will only study when the date of examination become so close. I prefer to study alone in my bedroom because if I feel bored, I can sleep and nobody can stop me. Normally, I study at night because that time I feel so calm and I can remember things that I read. Sometimes I make a short note or mind mapping, so that I can read again and bring it in my class. In a week, I think I only study about 4 hours. So I have a lot of free time.