In my head, this school, though it has grades 5-12, is only about 400 students because this is not a super huge town. Lunch is divided into two blocks, the first block being the even numbered grades (6, 8, 10, 12... which is why Ora in 8th and Arma in 12th grade are able to eat together) and the odds (5, 7, 9, 11).