How many students does Boya Yue Ming usually have in a class?

Boya Yue Ming teaches in a small class. There are no more than 20 students in a class. My son has only 15 students in his class. Teachers here can pay attention to and take care of every child. The teacher is very responsible. Not only can they give guidance according to the different characteristics of each child, but they can also talk with them often? My children often praise teachers, and the relationship between teachers and students is very harmonious. Teachers will communicate with parents at any time about their children's situation, so they don't have to worry that their children will be ignored and marginalized when they go to Boya Yueming.