It wasn't exactly every day that a literal, real, non-fake-news zombie apocalypse started during school, especially one where three teachers murder students who fail their tests/exams, but it happened today, I guess, so that's fun, at least you have three murderous teachers 'on' your side, right? I think. Though three against probably billions isn't exactly in the three's favor, so, that sucks, but it's at least a bit comforting, I guess.
You all are simply in a classroom, all the windows and doors boarded up, and stuff, any phone-service is running out because people aren't exactly running the internet and stuff since the literal apocalypse started. Everyone is 'calm' for a zombie apocalypse, still pretty panicked, but calm for their probably certain fate, except Abbie, of course, I mean, he stresses over tests, he's going to stress over a world-ending event. Only teacher that's kind of not really doing well is Miss Sasha, since, well, some of her kindergarteners are already... well, gone, since they can't exactly over-power a zombie, but she still has one left, who is crying, and she's cradling in her arms as a desperate attempt to calm them down.
Only supplies you really have is food, well, you kind of have it, it's all in the cafeteria, which, won't be exactly easy to get to, obviously, and I guess a stapler-gun or two that you can break to make it shoot out staplers more than just place them, so that's a weapon.
The situation isn't exactly good, with zombies roaming around outside, though none have noticed any of you, by miracle, and hopefully it'll stay that way, as long as nobody makes too much noise. The only sound is the soft buzzing of flys that are... sadly surrounding the dead kindergartener's bodies outside, which isn't really calming down anyone, it'll only increase the chances of someone going insane. Nobody speaks until Miss Sasha says something as to comfort her last kindergartener in-arms.
Miss Sasha: "I- It'll be alright, okay, sweetie? It'll be over soon..."
Do whatever.