*flashes back to highschool Tell everyone to grab a desk and a pencil or scissors. If the school is about to be assaulted the first thing that needs to be changed is the terrain. Open hallways suck. If we throw every desk into the hallway it will make the hallways harder to traverse. The next step is to prepare to fight. I would have everyone post either at a closed door way of a classroom or in the ceiling. Some classrooms are more dangerous that others. These rooms can be made into traps. Chem labs can be made into literal bombs. Turn the gas lines on, turn the lights off and take the lightbulbs out. Leave a staff walkie talkie in there and try to draw some attention with hope of gun fire or someone turning the light switch on. The people in the ceiling are capable of dropping in from above on top of anyone in order to get a few fatal stabs in. Now not everyone is physically capable of everything so everyone gets different roles for fighting. Athletic males (get medicine balls and dumbbells for throwing), Athletic females (get short jump ropes for close lining really quickly), Regular kids (get baseball bats, musical instruments, pencils, and other hand held assault weapons), Fat kids(won't move to fast so they get desks to slam into incoming enemies), also people from archery(get bows and arrows and are the first line of offense/defense).