Educational achievement at schools is amongst the lowest in the developed world, school discipline is non-existent and teachers get paid a pittance. What do you expect? To be honest, corporal punishment (reasonable physical chastisement) is what is needed to restore an environment where kids can learn.
Guardian Council reverses ban on 1,500 candidates in Iran's parliamentary elections (AP)
from the article: Report shows students allege mistreatment, violence by teachers