Go to school to go through the relevant formalities. There is no principal's signature on the graduation certificate. In order not to affect their admission, please go to the school to go through the relevant procedures in time. According to the Provisional Regulations of the State Council on Higher Education Self-study Examination, the graduation certificate of self-study examination is sealed by the provincial examination committee and the examiner university, so it is also in line with the regulations that the examiner university only seals the official seal without the principal's seal.