Haha at some of this stuff.
In my school the actual IT teachers are useless and are usually old science teachers.
The techies are useless apart from one but he is lazy.
We have a few things blocked like task manager and we have Windows XP. Winkey + r isn't blocked which is fun.
Most people in my school know nothing about computers except this one kid i know and he is good he got banned a few times but has done some cool stuff to the school computers, he leaves next year though.
Portable firefox is good but we can download and run .exes and i am the only person who knows what a proxy is therefore the only person who uses it so it isn't blocked.
The most annoying thing about our school is that the teachers don't have full admin rights, they can view and use the blocked folders but they can't use task manager and things. Only the headteacher and the techies have full admin and i can't be bothered to try and get their passwords.
One thing we do have is at login you can use;
Username: guest1 (up to guest100)
Password: password
and then muck about in them and hack in them so they don't know who did it.