Teaching union representatives are furious that pupils expelled for carrying weapons, using a drugs and attacking teachers are being allowed back into the classroom.
Figures reveal that almost 500 pupils barred from lessons for serious incidents in the last five years had their decisions overturned and were allowed back into the class.
Said a teachers' spokesman: "This is completely ridiculous - we just do not have the facilities to manage this.
"500 pupils in a classroom? Bloody hell - we used to complain about 40 kids in a room designed for only 20 or so!
"And they're all little bastards, every single one of them. You just try teaching the little gits!
"Mind you, there's so many of them you can't see what's going on at the back. So if they want to beat the crap out of eachother back there, that's up to them, isn't it?"