Nowhere does ARTICLE IX state that all students MUST ATTEND the state provided school system. Neither does it state that every school must be uniform, only state schools. So, you could have as few as two public schools (system) which must be uniform, and all other schools could be private with no uniformity requirements. Nor does it state HOW these schools must be funded - by institution or by student enrollment. We have the same type of Article in the Florida Constitution.