According to what I said, the lecturer should have a master's degree in related majors, and it is best to have experience in studying abroad. For example, if you are a medical lecturer, you'd better have a master's degree in medicine first. Have corresponding post or clinical experience in a big hospital. Speaking of exams, there seems to be a special training institution. I don't know much about nationally recognized lecturers, but corporate lecturers often have corresponding training courses.