My son is using it. He is in the second day of this year, and the effect is not bad. It used to be too serious. It is impossible to go to junior high school without previewing. There are too many subjects for children to keep up with. I studied at home with my deskmate 100 for two months in the summer vacation. Website teachers are the backbone of key middle schools, and some of them enjoy subsidies from the State Council. My son won the third place in the final exam before the summer vacation, so I let him continue to use it this semester.