No matter how many classes there are, the number of children in each class should not exceed 10. Actually, eight children are better. A teacher's visual range in lectures and demonstrations is limited, and a parent participates in such courses as early education. Generally, children sit around the teacher, and the number is crowded. Children are easily distracted, and teachers can't control them. Compared with the quality, it will decline. Therefore, the effect is best within 8.

It is better for each class to be a room with a ratio of 1: 2 (rectangle), which is more convenient for organizing activities, such as running back and forth or running around ponies.