The lowest band 4 is necessary, and then if you have the ability, you'd better take a band 4 or 6 exam. If you want to be a teacher, you should at least be able to communicate simply, otherwise the students won't understand what you are saying.

According to Ministry of Human Resources and Social Security's prediction, international teachers of Chinese as a foreign language have become the scarcest talents in China's education and training industry, with a gap between 300,000 and 400,000. After working for 1-3 years, the average annual salary can exceed 1 10,000, and the annual salary of excellent international teachers of Chinese as a foreign language can even reach 200,000. And there are more employment opportunities abroad!