K 12 or K- 12 is the abbreviation from kindergarten to twelfth grade, which refers to the period from kindergarten (generally 5-6 years old) to twelfth grade (generally 17- 18 years old). These two grades are the United States, Australia and Australia.

preschool education

China's preschool education is an important part of China's education, and its form is mainly urban kindergartens, with three-year system and one-year or two-year system. There are full-time, half-day, boarding and timing systems. In rural areas, preschool classes are the mainstay, and there are seasonal kindergartens.

In the old, young, marginal and poor areas, besides formal education, there are flexible and diverse forms of informal education, such as children's activity stations, game groups, roving tutoring stations and caravan services. Preschool education in China has developed in multiple channels and forms in accordance with the principle of running schools jointly by the state, the collective, citizens and individuals, which has greatly promoted the development of preschool education.