Supplementary and Continuing Education Act Article 16

A student who, at any level of supplementary compulsory education school or supplementary advanced education school, completes the main coursework taught in the same grade level, in a [regular] school, in the same category and at the same level, and receives passing grades, may apply to transfer into an appropriate class at a regular school in the same category and at the same level. However, where admission is subject to age restrictions, these restrictions shall apply.
中文原文 補習及進修教育法第16條
各級國民補習學校及進修學校學生修畢與同級、同類學校相當年級之主要科目,成績及格者,得申請轉學同級、同類學校程度相銜接之班級。
但有入學年齡之限制者,從其規定。

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