Around 300,000 high school students will take IELTS for overseas university entrance, but this is a small per cent and Chinese tuition centers tend to dominate the market. Due to higher expectations this market tends to generate lots of complaints, so it is best avoided
One of the barriers you have is the Chinese obsession for tests and the inclusion of translation in tests, if the tuition is not textbook or test orientated then many parents are not interested. However, there is some interest in CEFR A1-B2, with A2 Key probably being most popular.
The problem you would have is registering a new business and working legally, due to what is called the double reduction policy that led to the closure of many tuition centers. However, it is possible to set up a non-curricular tuition business such as ELA or Activity Based Learning.
Let's do the college entrance examination English papers in the past few years first. Then see how the score goes. Then consider the problem of being a tutor.
the answer is yes. according to the estimation, the international schools,bilingual schools as well as training organizations will boom. the growth for the foreign teachers in 2025 will rise up to 200% to 400%. it's still a good market.