[desireco42]

My kids went to Montessori school, first private which was good, they learned a lot of life skills, not so much academics tbh, which is why I switched them to public Montessori, which was in name only.

What worked for us better is competence grading which is Summit system that originated in California.

But principles are system are great, if you can make it work. It requires effort from teachers and parents and all. It is not trivial to make it work everywhere.