some of this works but all school computers ( unless the ones that are poor and cant afford protection on there pcs) have it to where on shutdown every download command ETC.... will all be deleted except for the stuff the admin specified so ur account will be deleted and wont work. also when you use that that computer can have a server user logon system to where when u turn on ur pc and the logon screens pops up its coming form the main servers pc and lets u logon so once logon and u try to change a password the server rejects it and wont let u at all.

And not to mention most school computers have keyloggers and recorders installed on there pc to see what ppls doing.