Hey
drugs for schitzophrenia can be rough... I understand. I don't know if I would advocate going off of them though -- the on/off drug roller coaster can really suck. If you go off the drug, and start to experience another psychotic episode, you'll realize why you were on them in the first place -- and have to transition back onto them.
You really really shouldn't smoke pot while you're on these drugs. Or drink, or add any other drug to the mix -- even caffeine, really. I've found that taking care of my body and giving myself space has helped. I'm not schitzophrenic, but have a close friend who is. I do suffer with other mental issues. And I watched my friend go through a few rough patches.
I guess it's all your judgement, but I think you should try to ride out the drugs for now -- this may sound silly, but trying to deal with the hormones and things you experience as a teen, and trying to gain a grasp on mental illness can be hard. Does school really matter? Is it a test of your intellegence? No. You shouldn't judge yourself based on previous standards only -- it's not helpful. You should judge yourself on how well you do from day to day, and what you learn about your experiences.
Anyways, good luck. Everyone has to make their own decision about drugs, prescribed or recreational.