你係媽媽點樣做

GAT

I will observe the kid to see what's wrong happened and try to figure out why it happened and the context it happened - drop it down in notes.
arrange for a day off to observe his school life in school - on this you have to arrange with the teacher and the principal.
after that try to see what you can teach him on your observation.
Sometimes the baby need some time to adjust to the school. Give him more time to adjust first and at the same time you try to teach him to the right track.
Seek for professional advice if situation continues - believe that you are already waiting for medical examination.
Do find another kinder more suitable for him if situation continues after 2-3 months. It the teacher is not helpful and don't like him at all, the school will not be able to help your son.