Question

every year at least 50 class room desks have been damaged because of irresponsibility of students .How can this be tackled

Answer 1

You could assign a specific seat to a specific student and make a class map. You can check the desks every once in a while and if a desk is damaged, the student associated with this seat is responsible.

You should make it clear to your students that they are responsible for their seat, even if someone else breaks it.