Correspondence is a learning form of adult college entrance examination (adult college entrance examination is a type of adult education), and other learning forms of adult college entrance examination include amateur learning (evening college) and full-time learning (note: after 2008, ordinary colleges and universities have cancelled full-time graduation certificates of adult college entrance examination, and now only a few are left). Passed the national adult college entrance examination and was admitted to colleges and universities, and issued admission notices. Belonging to the national education series, the state recognizes academic qualifications, participates in the national unified adult college entrance examination and enrollment examination, and all provinces and regions organize enrollment in a unified manner.