1, medicine. Persuade people to study medicine, and the sky thunders. There is no doubt that the medical profession ranks first. The medical education system is very long. Basically, the undergraduate course is five years, and it is not easy to find a job after graduation. The minimum requirement of a top-three hospital is a master's degree, so you need to consider studying for a doctor's degree, otherwise you will not win the trust of patients. There is still a lot of knowledge to learn, and it will take a lifetime to learn, not only from textbooks, but also from practice. It is not a problem to be a mouse. Studying medicine is a word, never too old to learn.

2. Law. Persuading people to learn dharma is 1000 yuan. Don't mention how difficult it is to study law. Reciting is a common practice. Suppose a book as thick as the Civil Code needs a lot of brain power to read it thoroughly. Not only that, the requirements of legal logical thinking are not low.

3. Mathematics. Mathematics requires people's logical thinking very highly. I believe everyone should go to college and rack their brains for advanced mathematics. What's more, the mathematics mentioned here is not high school mathematics or advanced mathematics, but a collection of all mathematics. Mathematical analysis, analytic geometry, advanced algebra and ordinary differential equations don't bother you. Learning real variable function and functional analysis is very difficult, especially difficult and painful!