You seem to misconstrue what I'm worrying about. I'm worrying about your poor mother dealing with a child who seems adament on opposing a very reasonable demand for the sake of a video game. That shit is stressful as hell.
When you have to deal with your own bullshit and all problems you create are your own problems to solve, that's great, it's your perogative to either make them worse or better. But if your mother is your caretaker, and your mother is imposing this rule, the least you can do is oblige her. A video game isn't worth antagonizing your parents over, and it certainly won't be optimal for you if she catches you trying to work around it.
Seriously, she's not being an ogre or anything and taking away everything, she just wants you to fully concentrate on studying when you should be studying. She almost certainly did this because something in your actions is worrying her. And maybe there's a grain of truth to her worry. If you can't stand being unconnected for an hour or three for studying to the point where you're asking people for work arounds to the parental controls, you might honestly have a problem.
And besides, if you just finished studying sooner, you'd likely have more time to waste browsing this forum anyways.