Don't get me started... the hours I've wasted on here rambling about this are outright shameful.Long story short: nothing works as well as adderall for me. Combining them tends to ruin their effects, generally. Really good clean meth will work almost as well as adderall, but just never hits the same level as the clean pharmaceutical stuff.Just my two cents. 2-FMA was a big disappointment, after I read one or two people say they replaced their adderall with it. 4-MMC (mephedrone) I guess could work for studying, but I don't care for it, personally. Cathinones also aren't known for their studying enhancing properties, to my knowledge, but your mileage may vary. That's about all I have to say as far as the hard facts go.