I attend a fairly small school, less than 100 students actually . So there are just sign in sheets in the lunch room, go by them everyday first thing in the morning. Mark once for the morning, and once for the afternoon. If someone is sick the teacher will mark an O instead of an X where their name is. It's a small enough number of students to easily keep track of. If you don't sign your attendance and the Gym teacher catches u thats 10 push ups i wish we did a swipe card, it seems way cooler lol.