If you just want to live now, learning in Grade One is really enough. After all, those functions and calculus are basically not used in our daily life. But those mathematics can exercise our logical thinking ability, and its effect is chronic and will not be immediate. Education is also to improve people's comprehensive quality. It is not difficult to find that in the process of learning, we unconsciously cultivate our own qualities such as patience and perseverance. Especially in China, a society where diplomas are popular, it is better to learn some math by yourself.