Primary and Junior High School Act Article 51

Citizens must be at least 15 years of age for admission to a school’s continuing education department.A primary school may assign new students in its continuing education department to classes that are consistent with their level.Citizens shall meet one of the following criteria for admission to the continuing education department of a junior high school:1. The person has graduated from primary school or from a primary school level supplementary compulsory education school.2. The person has passed a Self-Study Academic Ability Assessment Examination and has the academic ability of a person who completed primary school.3. The person has an educational level equivalent to having completed primary school.A registration system is used for the admission referred to in the preceding two paragraphs and the application procedure; the associated directions shall be prescribed by the special municipality and county (city) competent authorities.
中文原文 國民教育法第51條
學校進修部之入學年齡須年滿十五歲。
國民小學進修部新生,得由學校編入與其程度相銜接之級別就讀。
國民中學進修部之入學,應具有下列資格之一:
一、國民小學或國民小學補習學校畢業。
二、經自學進修學力鑑定考試通過,具有國民小學畢業程度。
三、國民小學同等學力。
前二項之入學方式及申請程序採登記制;其相關規定,由直轄市、縣(市)主管機關定之。

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