A school obviously needs students in order to become a real school. Without the students the school is just a building. Make sure complains aren't there and that your students love to go to your school. To keep them healthy let them play soccer every day. Free pizza in the canteen is what your students love, but it might not be so good for their health. A little bit of salad in the vending machine can change a lot, it's all up to you. Also don't forget to keep them happy at all times. Don't let them work in the garden too long and create a big party every now and then.