At present, the salary of IT is very high. Whether it is testing, programming, etc. If you want to master it, your salary is above 4K in the mainland, let alone in first-tier cities. It is easy to double, so they dare to promise to pay after employment.
To put it simply, you can know how many students they train in a class, how many students are arranged to go to enterprises, and how many get high salaries, depending on the level of their teachers.