Analysis:

Mathematics is a relatively difficult subject in primary school, junior high school and senior high school.

There are many problem-solving skills in mathematics. If the level of math tutors is relatively high, the effect should be obvious.

There are many theorems and formulas in mathematics, but we can't just memorize them, but we need to understand them. Ah, some primary and middle school students can't keep up with the teacher's rhythm in class, which leads to the decline of mathematics level. Then extracurricular tutoring will be a very useful supplement.

Mathematics is not only important, but also effective in family education. So mathematics is the most profitable subject.