The real effect of learning mathematics is not reflected in exam-oriented education, but in one's own mental thinking about the future. Learning mathematics is a process of thinking exercise from simple to complex. Many people think it is useless to learn math knowledge in the future. Indeed, if they don't do relevant academic work in the future, they basically don't need much knowledge learned from mathematics. On the other hand, people who are good at math can often handle many things clearly, logically and subjectively. Many people use stupid methods to solve problems, and they can often hit the nail on the head with their own thinking. And there are all kinds of reverse thinking and transformation thinking. If there is accumulation, it will be of great use.