After a student accidentally dies and she gets the blame, a burned-out teacher goes on the run, but when news spreads and kids’ behaviour and test results improve nationwide, teachers unite and she must lead them in a revolution to bring fear and respect back to the classroom.

I think you've almost got the comedy across but there needs to be an antagonist to help punctuate the irony.

Here's a different take (with some alterations): When an overly-strict teacher intimidates her underperforming classroom by spreading rumours of killing a student, the murderer ? an unstable student councillor ? is tasked with assessing her psychology during undisciplined supervised ?teachings?.

By the way, was your story idea inspired by this Rowan Atkinson Live skit, Headmaster Kills Student?

I think this would work better if the teacher Spanked the student instead of murdering them.

My generation saw the last of corporal punishment in American schools. Though a swat on the rear with a two-inch thick hickory board may have kept a class of rowdy boys in line, we never faced capital punishment.

Sorry, but I can't buy into the premise. Discipline does not require corporal punishment, rather it requires that sanctions be consequently? administered. If you break the rules, you face the consequences. I think all you need is teacher who takes a hard line, but get results -- not one who murders her students.