I am a national examination student in 19. At that time, I took his ground system class. Now that I think of him, his slogan "Quantity has no equation, data has no calculation" still echoes in my mind. But everyone who attended the class understood, haha, it was really amazing at that time, and the relationship between quantity was just beginning to learn. I just gave up and didn't do it. After getting to know Wang Yongheng, I was at least half right. There is no calculated data. I thought it was impossible. When I was in the exam, I could finish 20 questions in 20 minutes by his method. You can search his videos online, hoping to help you.