A child is not enrolled in an official school. They're kept at home and a parent teaches them. Typically, the parent will arrange yearly tests with local schools, to verify that the child is making progress.

小孩不去上小学中学之类的，在家里请私人老师教。 通常都是很富很富的家庭啦

Homeschooling is an option for parents in most countries that provides their children with a learning environment as an alternative to government or private schools outside the home. Some parents become concerned about the traditional school environment, their children may have been bullied, or they want to provide religious or moral instruction, or are dissatisfied with the curriculum at their local government and private schools.