well i really need to start focusing in school but im not stopping any drugs.
Take it from experience, this just isnt gunna work.
If you want to do well in school tone it down majorly, or quit the drugs completely.
There are a selected few who can still drug out and do well in school, but it's only a matter of time until the tides turn and things stop going in the right direction for them
What you'd be doing in the situation you've presented is just adding on another substance to your list of habits and possibly addictions. You'd only be masking a problem, not helping to fix one.
Caffeine always puts me on some what of an edge. Im not so much concentrated as I am minorly buzzed. Sure every so often im able to sit down and really get some shit done, but thats always inturrupted by periods of not really being able to focus at all as my mind is somewhat racing.
I've read your posts, I know your history,
tone it down. To be completely honest here, and I dont mean to sound rude at all, but im surprised you're not living on the streets, and if you continue the way you are now, (in a DGAF i'm indestructable sort of way), you're going to end up on the streets soon enough.