Whether the students are clever or not. In education, I personally think that the most obvious subject is mathematics. Mathematics, if you understand it thoroughly, you will find it very simple. There are fixed rules in it, and there are rules. But if you don't understand it thoroughly, you think it's simply astronomical, and you can't understand it at all.

Whether it is elementary mathematics before the university or linear algebraic probability theory of advanced mathematics after the university, we can master its operation law by exploring its laws. If we know its law and its origin, it will be easier to learn this subject scientifically. And mathematics is a subject that can improve scores in a short time. As long as you understand its operation law and suddenly understand it, mathematics will become very simple, so the substantial improvement in mathematics scores shows that this person is in mathematics.

After going to college, people learn some mathematics, because the foundation of economics and management and science and engineering is to learn mathematics, and other majors don't, but the mathematics learned in college has a common feature. Abstraction is an abstract thinking, and it may be difficult to respond to a certain situation in real life. It is abstract and non-existent, limited to things in daily life, but its operation law is very regular, and it is also very important to physics and astronomy.

Before high school, some subjects people studied were nothing more than Chinese, mathematics, English, history, politics, geography, physics, chemistry and biology, which could be simply divided into liberal arts and science. Chinese, English, history and politics are all liberal arts. As long as you have a good memory, there is not much problem. Mathematics and physical chemistry can be divided into scientific things, but physical chemistry is based on mathematics, so mathematics is the most fundamental and basic subject.