the school holds big thirteen classrooms one for each grade including kindergarten along with a band room , a lunch room , a machine shop , and a housekeeping salon so all the kids in each grade study , work , play , and fight together like a litter of kittens then move like a group of fish to the next grade until the big smart-ass teens after years of annoying their wise elder teachers graduate high school making each class on the average about 40 kids more or less .