You don't need a teacher qualification certificate to obtain a major. I am a normal graduate, and I have already issued a teacher qualification certificate when I graduated. However, if I am not a normal school, I will take the exam. Generally, you have to register first, and then take the Putonghua exam. Now it is usually a computer test, and then a written test, including two subjects: pedagogy and psychology. I can go to the bookstore to buy books on this subject and then do the questions after reading them.