I don't know. It's simple. What are the children doing at home when they are not at school? I went to early education at the age of three. There are many kinds of early education. You can choose your own children to develop your brain, and then go to small classes at the age of four, middle classes at the age of five, large classes at the age of six, and first grade at the age of seven. Note that the children mentioned here are all nominal years old, so some children were born after September, so they can't go to preschool in grade one, and they can't go to primary school until the next year, that is, when they are 8 years old.