I pick my high school What i would do is have everyone gather in the gym which is very far from the entrance then workers would come with kitchen knives pencils barricades an dother weapons I would go to my locker and grab the student protection shotgun and kevlar armor i have ( my high school had a team of 5 students that were fit for the job of carrying a shotgun and heavy kevlar armor ) Then me and my team of student pritection unit would have the 6th member ( a straight A student ) on the cameras giving us details and shit Then we would shoot the shit out of the guy who is found