K 12 or K- 12 is the abbreviation of kindergarten to twelfth grade, and it is the abbreviation of preschool education to high school education. Now it is widely used to refer to basic education. Refers to kindergarten (generally 5-6 years old) to 12 grade (generally 17- 18 years old).
These two grades are the first and last grades of free education in the United States, Australia, Britain and Canada, and K- 12 is the international collective name for basic education. K 12 is mainly adopted by the United States, Canada and other North American countries.
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Just as China's nine-year compulsory education has its corresponding nine-year compulsory education syllabus, North America's K 12 education also has its corresponding education syllabus, namely CCSS(Common Core State Standards), which is the educational standard for American students to further their studies and obtain employment. At present, 45 States in the United States have begun to use this standard.
Although the vast majority of States in the United States initially joined CCSS, some States have withdrawn or are preparing to withdraw from CCSS. The main reason is that there are different voices about CCSS from all walks of life in the United States, mainly from teachers, parents and some local teaching and research personnel. They believe that such a set of educational standards will solidify children's thinking and obliterate children's personality.