Every day we dropped him off he would cry and throw a tantrum, and it would break our hearts, but you know... that's life.
He was falling behind all his classmates, his speech hadn't developed, he didnt sing the songs, do the dances, etc. All the other kids were doing great.
I attended one of his classes and noticed he refused to sit at his chair, all he wanted to do was stare out the window to try to spot airplanes.
That's when we decided to switch over to Montessori, mainly because I wanted him to have more freedom, and at least enjoy school even if he didn't learn much.
The change frankly has been incredible, after just one week he was waiting inpatiently at the front door of our home, anxious to go to school. The only crying when we dropped him off was from my wife, when he ran into the school without looking back every morning.
His speech and abilities have normalized with the rest of his class after a year.
Now I'm not saying everyone will have the same outcome,maybe he just grew and would've developed any way.
I just wanted to share my personal experience in case anyone finds it useful.