The first category is cognitive early education for infants under 3 years old;
The second category is skills classes such as Pinyin, Arithmetic and English for 3-6 years old, and also includes competition classes such as Olympic Mathematics which have been banned in primary schools.
The third category is ballet, taekwondo, art, piano and other interest classes, 3~ 12 years old, even suitable for older children.
What I want to explain is that I won't give a simple conclusion about which stage and which class to attend or not-because every family and every child's situation is different, and every parent should make his own choice according to his own actual situation.