The most important things: 
- do more excercise to be heathy and keep fit.
- sleep more to keep our body in the optimum status, and ready to study on the next day. 
- wash your hands more to prevent illness.
- eat less junk food and soft drinks to be heathy.
- watch less TV to focus on homework, housework, and do out door activities.
- spend less time playing computer games keeps ours eyes from dryness