high school hassle

okay so your in high school now. You were doing fine but suddenly everything goes into hell. The sirens sound and it tells that the country is in war with. some the kids in school just make fun of it but after a few days chemical weapons and biological weapons hit your country and it turns literally everyone into zombies. most of the people are infected bit youre not. anyways now its day 0 and its noon...the school is chaos and suddenly you bump into an older couple who are last period. you 3 go into a room and wait till everything gets quiter.