Can you cite that? You're opposing mainstream medication usage all over this thread, so it's hard to take each comment as gospel.
Regardless of my personal experience or your personal experience the evidence does not show that stimulants increase grades in the medium or long term.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4172306/?report...
I am still trying to find the studies that indicate that stimulants might increase high school drop out. But there is pretty clear consensus that they don't increase grades over the long term.