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i tried a ritalin (Methylphenidate) 30mg capsule
this shit is actually fucking useless, it's okayish if you for example need time to finish a project in 2 days, so you can sacrifice your sleep and just pull 2 all nighters with ritalin, but for studying it's shit, 0 improvement regards concentration and nasty side effects (like terrible insomnia, heart racing, sweating, diarhea ...)
just take some form of caffeine (tea, bepis, caffeine pills) very similar effect without the problems of getting the ritalin, the higher costs etc.
if you rely on caffeine/ritalin or some kind of drug for (academical) performance you should change the field you are pursuing
