What preparations do I need to make if I want to take part in the photo contest?

Answer; You can try to photograph the shadow in the sun when a student bends down or squats down to pick up a mineral water bottle. Don't shoot people, just shoot their shadows and mineral water bottles. Try it and see how it works.

Or take a picture of a student smoking in sunglasses, but there is a "No Smoking" sign behind him. good luck