Those schools man..
they first invented fire drills because schools in the old days burned. It was a necessity to teach the kids about those fires.
Then the nuclear age happened..of course "duck and cover" of the atomic bomb! happened. Of course, nuclear bombs could really happen in those hot cold wars days.
But today kids in school must worry about some guy shooting them. So I propose shooting drills. At least once a month, the principal would dress in a black suit and be a fake shooter with a fake gun. Other people would be in the scheme too, they would scream and pretend they were shot. So every month while the kids were studying math someone would scream in the middle of 2+2.."Somebody is shooting! Somebody is shooting! AAAAAAAAHHHH!"
Then the kids would run, to learn a lesson. After all that, the teacher would say..
"Come on kids, the shooting drill is over, go back to math. Hey, you too kid, nobody is believing in your fake epileptic sezure." Then they would go..