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Drawing lessons from Europe, America, Japan and South Korea: Controlling the class size of primary and secondary schools and universities to 15 students to improve the quality of teaching and training.In Europe and America, many schools attach importance to teaching in small classes, and it is more common to control the class size to about 15 students. In the United States, for example, some high-quality primary and secondary schools and private universities often adopt small class teaching mode. According to the data of American educational research institutions, in the small class teaching environment (15-20 students in each class), students' academic performance has been significantly improved in reading, mathematics and other disciplines. For example, in reading, the average improvement rate of reading ability of small class students is about 20% higher than that of large class students. This is because teachers can adjust teaching strategies more accurately according to each student's reading level in small classes.

1. Improve the teaching effect.Drawing lessons from Europe, America, Japan and South Korea: Controlling the class size of primary and secondary schools and universities to 15 students to improve the quality of teaching and training.1. Improve the teaching effect.

1. Challenges and countermeasures of educational resourcesIn Europe, countries such as Finland, which are famous for their high-quality education, also implement small class teaching. Finnish schools pay attention to the individualized growth of each student, and the class size is not large, so teachers have more time and energy to tap the potential of students. Teachers can tailor their study plans for students according to their hobbies and specialties. In this educational environment, Finnish students have performed well in programme for international student assessment and other tests, and their innovative ability and comprehensive quality have been widely recognized by the international community.2. The change of social concept and educational concept