In the era of wiki/scihub/libgen, the whole tutoring industry is worthless. They are just making easy money taking advantage of information asymmetry. Generally, easy money will not be allowed in China. Edited: I'm talking specifically about Chinese tutoring industry. One comment below gives a very detailed description, which perfectly explains why I think it's worthless. We are all in the process of a revolution ini…
This generalized pronouncement may be a bit premature. A lot of people do not work well doing self study. A lot of people need to ask specific, difficult to anticipate questions before understanding a topic. A lot of people lack the self discipline to study without the accountability of another person. There are a lot of reasons to hire a personal tutor beyond using them as a living breathing codex.