At my school we use iPads (I don't know why) and the teachers can see what's on your screen, lock you inside an app, block apps/basically everything, lock/shut down your iPad, uninstall apps and they can even see what's your location. It sucks ass, but with my "professional" hacking skills I figured out a way to hack the system. If I use a VPN, for some reason they can't do anything to my iPad. I'm still waiting for the day my school is going to ditch iPad's an buy us laptops, but at least I can sleep good at night without having my teacher doing stuff to my iPad.

(I have a ton of other things I don't like about my school, and would love to rant about, but I don't want this rant to be 5000 pages long)