When I was in school it was hilariously easy to get around anything blocked. You just had to enable admin functions through command prompts and you were good to go. I also had a class where the teacher downloaded some freeware so he could see other people's screens from his or take ours over for lesson stuff, literally anyone could download this and use it, he was a fun dude who probably dosed James Cameron with PCP so he got a laugh about it.