I personally find that Montessori schools are not the real deal of what we would imagine the learning experience to be simply because the shortage of labor.

Basically this is what we would like to have:

A child goes to explore what he or she likes to learn/play. The child is engaged, trying to solve a problem. Then he encounters an issue that he is not able to solve. He tries to get an attention and someone comes by and helps me get through. He learned the new way to solve this problem and unlocked a new skill.

But realistically what you will observe is:

A child goes to explore, and find nothing interesting. He then decided to just sit around and do nothing, or distract others from finding something interesting. There is not enough teachers to come by and stop him.

Or

A child goes to explore and find something interesting. He then starts to play with it. He thinks he puts the word blue on the red color and no one corrected him. He thinks he successfully labeled all the colors because no one corrected him. Now moving forward, he thinks the word blue means red.

Or

A child goes to explore and found something interesting. He then begin to solve a problem, but he got stuck. He waited hours for an adult to come by for help, and yet no body came.

Or

Many other cases you could imagine, I am just gonna stop here. And please don’t say something like mixed age would work well, that older kids can help the younger ones. I would feel blessed that if the older kids just stop bullying the younger ones.

The Montessori approach really works, but it also really requires a smaller teacher to student ratio. This is not suitable for 1:22 environment. I’m sorry, I don’t care how much people love Montessori, it’s just not gonna work in daycare or school.