If by "school" you mean "Amish" they are a religious group that are somewhat hard to describe, LOL. Theoretically they don't believe in using electricity or internal combustion engines. So they use horse and buggy, non-electric tools, etc. But actually they do use some electricity as you can tell by the headlights on the buggy below.
They are prepared for the apocalypse for the most part. Except they are pacifists, so I don't know how long they will survive without rule of law protecting them.
They often have a very good working relationship with the prepper community since they have many common interests, so I suspect some preppers may step in and protect them even if they don't want them to.
Mennonites are related but most Mennonites use electricity and drive cars.