my son studies in international school since year 1 and now is year 3, the school has support for special need child that makes my son improve a lot and most importantly we found he really enjoys the school life.
My son is also attending international school. We disclosed his conditions to the school and the school is caring and understanding. My son loves going to school.
You will find related information if you google "international schools in hk with SEN support". There are quite a few. ESF is amongst the most sought after ones but difficult to get a spot if you don't have priority.