People that don't understand the meaning of over studying.
When I was in middle school and possibly even elementary school, my mom used to force me to study pretty much all day and I didn't get to do any of the things I liked that day. It was boring and rather tiring, sometimes I ended not remembering most of what I studied because of this. I mean yes I know I struggled in school and yes of course I want to pass, but their is such a thing as over studying and my mom did not seem to understand this, at all and if she did somehow, it did not seem so. It didn't help that sometimes I did pass my tests (Which I admit sometimes I cheated on) leading to her into thinking all this extra studying was helping, when in reality it really did more harm than good for me. I mean yes the studying probably did help at times, but only to a certain extent.
I eventually got so tired of being forced to study so much at home and not getting much out of it, I stopped bringing home my study materials because I felt it wasn't worth the expense. (A feeling I still have to this day) Weirdly more often than not I actually did better if I studied a few minutes before the test than I did spending all that time at home, even with no prior studying and this only further drove me away from studying home as well. My mom understandably got upset when I did this and while it was probably a bad idea and my grades plunged at times, I still cared about my test scores. I still tried to find a work around (Which I eventually did) so I wouldn't have to study so much at home. Come time to high school, things got better thankfully and it wasn't quite as bad. Whether or not my mom truly knew why I stopped bringing stuff home to study, I don't know for sure.
While I may have went on a bit of a tangent here, you probably get the point by now. I cannot stand those that don't seem to understand the concept of over studying and while I don't have these problems anymore, it would still bother me if I did.