This course is different from ordinary high school mathematics courses. Totally different. This course is equivalent to junior college, and ordinary high school is to prepare for college. Studying in high school for several years is not easy for children in key high schools or ordinary high schools. Children in key high schools, even if they study hard, are there with the joy of growth, a sense of accomplishment, and confidence and expectation for the future, painful and happy. For most gaopu children, the harder they work, the more desperate they become. What's more, I suffered for three years and suffered setbacks for three years, and the college entrance examination didn't get much return. In recent years, parents and children have generally not suffered.