The answer is not hard to think of. First of all, one's own talent plays a great role in it. People with high talents are often superior to the average person in some aspects. When you are still thinking hard about how to start with that problem, people have thought of several solutions and got the answer soon. When I was a student, my deskmate was a person who was very sensitive to mathematics. Every time I see a topic, I can understand the meaning of the topic faster than I can, see the essence of the topic clearly and solve the problem in a very simple way. For example, running, there are great differences between ethnic groups. For example, black people have good endurance and high explosive power, but poor coordination, while yellow people have poor endurance and explosive power, but good coordination, so white people walk in the middle.
Secondly, a person's good study habits are also very important, which is the acquired reason. A person's concentration and enthusiasm for learning are very important. Dedicated people can find what they want from problems more quickly, mobilize the knowledge stored in memory more quickly, use it efficiently, and solve problems quickly. Their enthusiasm for learning means that they can keep learning efficiently for a long time without getting bored, and even find pleasure in learning, so as to study and think more deeply and gain more knowledge.
There are some other reasons that also play a role. For example, family education used to be a poor family, but now it is a little different. The children of the rich can get education earlier and receive high-quality knowledge in advance, while the children of the poor are often limited by poverty, some have to give up their studies early and join the society, while others are influenced by the educational environment and cannot study hard. There are also poor children in the youth league, which is inseparable from their unremitting efforts and tenacious will.