How do you study?

I attend class, and absorb all the information there. Then the night before the exam, I go through a mental rundown, and I'm set; havent bought a textbook since second year with no regrets.

For myself, being a music major, I pay too much attention to music, so when I have music on when Im doing hwk (or the rare time I actually do sit down and look through notes), I cant concentrate and will be listening to music more than being productive.