You at ? high school? or college? If high school sleep as much as you need, those are cookie cutter classes. Well you can also do what Osmoses said drink some stuff with caffein in it.
For homework, if you have trouble with HS homework, your future already doom, if you are too lazy to do them, then first break your d2 cd, then break the Tv, then call up all your friends telling them you are a fag. Now you have all the time in the world for yourself .