i don't think it's pretty dumb...
many people prepare for the test who have been out of school for a bit of time, some even years. others, like me, slept through physics, took orgo as a freshman, etc. i didn't even remember what a nucleophile was...but that obviously wasn't any issue after reading a chapter in EK or TPR.
3.5 months is plenty of time if you know how to study efficiently (which means always doing passages after each chapter to ensure you actually understand it, try the TPR workbook, EK1001s, etc.). as far as the basics- in part, yes. they aren't going to test you about all crazy specifics, you won't have to do the quadratic or calc in physics or other stuff you'd have to do in a undergrad course. most of the battle is knowing your stuff - which you can do with some heavy content review for 1.5 months, but the remaining part, which still is a huge deal, is learning the ins-and-outs of the test and how to attack each passage. after your content review, do everything AAMC 1.5 months before the test, fix weaknesses, and you'll be fine.
in retrospect, i think my time spent with khan was a waste. the videos are way too long, yet too basic and not worth your time. check out a couple of free chad videos. you can watch them on higher speeds, he says things like pka your mom and uses other crazy examples. if i had to redo my content review phase again, i would have thrown out TBR, TPR, and EK and would have gone with him (while keeping the TBR and TPR for passages).
and don't do 8.5-10 hrs a day, you'll go nuts. have a tough schedule like SN2ed, which is pretty ambitious, and stick to it. goodluck!
