WELL. I got this stupid idea one day. We have an ice cream truck after scool at my school. So. Anyway, you could buy stuff somewhere(drinks, candy, chips), and then bring it to school and but sell it like a lil bit more. Maybe 50% more or something. Like if you bought a candy bar for $1.00, you could sell it for like 1.50. Or maybe less for bargains lol. Make sure you are careful and secretive though. Ask privately, watch out fot supervisors. Or you could just do chores. Or like do favors for people at school. Note: If u do the selling thing, make sure u carry tons if quarters and stuff. Change lol.