Children of school age ... How do they do with measurements and insulin?

I would like to know their experiences, with children who are in the garden or at school.My son goes to the garden and takes the snack at four in the afternoon, we go every day at that time, but when he goes to school, how are we going to do?It will be without eating many hours, you will have to take some slices of apples until you get home and Mernda ... how do they do not live near school or when they work at the same school time ...?