I hear if you listen to some classical music (Beethoven, Chopin, patchable, Vivaldi are some classic composers) it will make you smart. I know a number of teachers in my area have their entire class listen to 15 mins to 30 mins of classical music every day, while the kids colour or do some other easy, fun task.
I also hear that classical music will increase your test scores if you listen to quite, calm classical music while you study. I tested this theory many years ago in high school but it didn't show very compelling results.