1)not throwing waste here and there. 2)having lunch and water without throwing it down. 3)using dustbins and washrooms properly 4)not spoiling the benches by breaking them 5) stop scribbling on walls
We can keep our schools clean, 
1.By throwing the wastes in the dustbins.
2.By appointing a leader for this.
3.By making awareness of the cleanliness which results in a good manner.
4.By nor scribbling in the benches, and the desks.
5.By not breaking the benches, and by not throwing the chocolate wrappers inside the classroom.

Hope this will help you.
thank you
pls mark it as best
It is best
pls mark it as the brainliest, thank you