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? Pwd= 1234 extraction code: 1234 K 12 education is a comprehensive basic education system from pre-school education to high school education, aiming at cultivating students' all-round development. It uses inquiry learning, cooperative learning, project learning and other learning methods to stimulate students' active learning and creative ability. The course covers many subjects such as language, mathematics, science, social science, art and physical education, aiming at cultivating students' academic ability, critical thinking and problem-solving ability. By providing rich learning resources and practical opportunities.