It's a great film to watch with a couple of mates and some booze. I particularly like that everyone who gets killed deserves it. Easily the best Terminator ripoff ever.
Why do these things always look like some cheap shit some nerd knocked up in his basement? This would be a much better idea if the teacher was a floating CGI head on a screen (not unlike Max Headroom or Red Dwarf's Holly) and it could send volts into tasers built into the kids' chairs if they misbehave.
Yeah, ain't it funny what circumstances may actually require? The aging population and low birthrates over there and all callin' for this for seriously rather than as a fun test.