0~3 years old. It can be roughly divided into three categories: 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 Olympiad, which have been banned in primary schools. The third kind of interest classes include ballet, taekwondo and artistic piano. From 3 years old to 12 years old or even older.