Spun seems like a good movie to deter people from ever using meth.

And I understand quitting meth can be difficult while in school. It gives you the ability to focus and take in information at greater speed than being sober. But you must realize that using a chemical in order to focus will naturally make your own abilities to focus decrease, which then will make it much more difficult to quit.

Have you considered switching to speed or even getting on a.d.d medication? Speed (at least crosstops) is habit forming, but its not addictive like meth.