You can't. The signature of high school graduation appraisal has legal effect. If it is found that the signature is inconsistent or the signature caused by the proxy signature is illegal, it will have a great impact on students' further education or employment. High school is short for high school. Middle schools in China are divided into junior high schools and senior high schools (generally referred to as junior high schools and senior high schools), both of which belong to the category of secondary education.