First of all, the first reason is that the education competition in society is very fierce, so in this case, parents and teachers hope that students' grades can go further. Although the Ministry of Education clearly stipulates that homework can't leave school, he still has to study after returning home, because from the perspective of parents, if the child's academic performance improves at this time, it will be very helpful to lay a good foundation for learning. It can make him more relaxed in the follow-up study, so after returning home, although there is no homework at school, he will not relax, and there may be some extra homework for his children to write.
Another reason is that there are many schools in the society now, and the most important criterion for distinguishing key primary schools from non-key primary schools is the enrollment rate. Only after the enrollment rate is improved will more talents enter this primary school, so in this case, the competition between schools is also very fierce. They must try their best to improve their students' grades. Although the Ministry of Education stipulates that homework can't leave school, they will leave something extra. For example, going to preview or review courses actually brings great pressure to students. Even without substantive homework, this task will be more than substantive homework.
Therefore, in today's society, whether from the perspective of parents or schools, the implementation of this policy is very difficult, because the current education competition is too fierce. There are thousands of troops crossing the wooden bridge in the college entrance examination, and it is possible to miss the key university by one point. Moreover, it is difficult to find a job after graduation. Only good enough people can enter some excellent enterprises, and some enterprises have very high requirements for candidate schools.