A local school readiness council may elect to reserve up to five per cent of the spaces in its school readiness programs for children who are five years of age and are eligible to attend school pursuant to section 10-15c. Such children shall only be eligible to participate in the school readiness program if they have been in the program for at least one year and the parent or legal guardian of such a child, the school readiness program provider and the local or regional school district in which the child would otherwise be attending school agree that the child is not ready for kindergarten.