It's an out of school activity, nothing to do with school. Its nothing other than boasting and one upmanship.
If parents want to do it, great, but it is unrelated to any school work/reward system. Wear it at home and in non school time.
DS2 upset he had no medal, he does not need to do kumon. He can't understand why he does not have one to wear in school, he's 6, and I have explained that some of his friends do something separate outside school, now he wants to do it! £55 a month for being talk the same as school, no!
So I will have him upset again tonight as there was a lot of medal boasting in the playground this morning!!
shall I talk to the teacher?