Article: Integrating the classic system after a Montessori school?

Whether they come from a Montessori, Freinet, democratic school, or any other type of alternative school, students will sooner or later have to return to the classical system. Indeed, these " different " schools mainly concern kindergarten and primary school, but only very exceptionally middle and high schools. Thus, many parents are concerned about this rehabilitation to a more traditional system. So, is this really realistic?