Help with Hacking a School PC

I need help to hack a school pc. They block everyhting (cmd, apps from usb, bat files,bios). All I want to do is gain admin access. I need to get admin access for a reason I can't tell. But if any one has an idea on how to do this, it woulod be great. I kind of figured a way but I don't think it would work. Get linux on a USB, Boot PC press the specfic button (I forgot the button) and chose linux. I really don't think it would work tough. Any ideas? By the way, they use PC's called RM one and RM one eco.