I can confirm. Montessori education is great for kids under 12. For middle or high school, it was actually Maria Montessori who said, when asked what she saw as

I can confirm. Montessori education is great for kids under 12. For middle or high school, it was actually Maria Montessori who said, when asked what she saw as the best education for teenagers, that it was useless to try to force adolescent to concentrate on intellectual work. Instead she recommended an Earth school, where children would live close to nature, eat fresh farm products, and carry on practical work related to the economics of supplying food, shelter, transportation, and so forth. The Montessori middle- and high schools that currently exist, at least in Europe, do not follow Montessori's advice at all. Instead they have a kind of half hearted mix of regular education with some elements of lower age Montessori, such as more responsibility to make your own homework planning. For many teenagers this is not a good combination and they drop out.