2. German majors mainly take the Calderov exam, which is similar to IELTS and TOEFL in English. German is called "telford"
German students had better go to Germany. In the German environment, the ability of grammar and oral English is also improving rapidly.
4. Germans are employed in China. If you don't want to enter German enterprises or joint ventures, you can enter the education industry. More and more people go to Germany to study, and they are all college students (mechanical, automotive, electronic and other engineering majors, with no foundation). Your level is enough to teach them. The monthly salary in a public institution is about 1-20000(a 1 \ A2).
I hope you can adopt it. Thank you.