Trixy,
There is a reason why your grades suck. Instead of doing your homework, you sleep, play, eat, or watch pirated DVDs once you get home from school. Same goes for the weekend. And did I mention that you eat too much? Oh wait, that doesn't have anything to do with your grades. :))
It wouldn't hurt to read your books (since you rarely take notes and you lost your only notebook) at least the night before a long test.
Save yourself while you still can.
-Yourself
