Classical music
Studies have shown that by listening to classical music or any type of music that has no lyrics while studying, you will be able to retain that information easier. Okay, so maybe this will not work if you are trying to study while listening to a hardcore techno song, but you get the point we are trying to make.
Try some classical music out next time you hit the books, it may also be able to calm you down and keep you focused on the task at hand. We are not sure if the old masters of piano knew what power they had, but we appreciate them years later as we study.