If there is a formal national qualification certification, the diploma can be found on the Xue Xin. The state recognizes this degree. There are two kinds of self-taught exams. One is that you register directly in the self-study examination office of the local education bureau, so you only need to pay the registration fee for each course of the subject you apply for, and you have to study by yourself. The other is to sign up at the local self-study aid point, so you need to pay tuition, and he will give you corresponding training. It is not so difficult to take the exam.