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2. The change of social concept and educational concept1. European and American cases

One of the biggest challenges to control the class size to 15 students is the allocation of educational resources. We need more hardware resources such as classrooms and teaching equipment, and we also need to increase the number of teachers. In this regard, the government can increase investment in education. For example, some governments in Europe and America support school infrastructure construction and teacher recruitment through special education funds. For example, some state governments in the United States will provide funds for building new classrooms or transforming existing classrooms to meet the needs of small class teaching according to the school's small class plan.1. Improve the teaching effect.This class size is also convenient to carry out inquiry learning. Every student has more opportunities to participate in discussions and experiments, and it is no longer a few students who dominate classroom interaction. In science class, 15 students can be divided into several groups to carry out experimental exploration, and each student can operate the instrument, observe the experimental phenomena and put forward his own opinions. This is helpful to improve students' scientific inquiry ability and innovative thinking ability.

1. Challenges and countermeasures of educational resourcesIn 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.In 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.