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This is a man made soccer field and it is a community park opposite to a school, not inside the school.
Is there any other reason that made it rejected?
Maybe bad luck and it's hard to see on satellite view. I couldn't find the goal posts looking at the park from above. Try adding a photosphere using the Google Streetview app then submit again. It should be accepted, imho.
Your photo looks fine. You could be a bit more descriptive with the description maybe?
Sports amenity/facility located in the North/South/East West of Koola Park
Something along those lines?