Altering the definition of "Tier I child" for purposes of publicly provided prekindergarten to not include 3-year-olds and only include certain 4-year-olds; authorizing an eligible private prekindergarten provider to elect to enroll 3-year-olds in publicly provided prekindergarten; requiring an eligible private provider that elects to enroll a Tier I 3-year-old to enter into a certain memorandum of understanding with the State Department of Education and the county board of education; etc.