Regulations Governing the Establishment and Assistance of Overseas Taiwan Schools Article 31

An Overseas Chinese School shall issue a graduation certificate to elementary and junior high school students who have completed their studies with satisfactory grades, or to senior secondary school students who have completed the required courses or credits with satisfactory results. Within three months after the end of the academic year, the school shall compile a list of the students who graduated and where each one is undertaking the next stage of their education and submit the list to the overseas mission with jurisdiction to forward to the MOE for future reference.
中文原文 海外臺灣學校設立及輔導辦法第31條
海外臺灣學校國民中、小學學生修業期滿,成績合格者,或高級中學學生修畢應修課程或學分,成績合格者,由學校發給畢業證書。
學校並應於學年結束後三個月內,造具畢業生名冊及其升學情形,報轄區駐外館處轉本部備查。

English translation for reference only; the Chinese text prevails. Not legal advice.