Regulations for Technician Skills Certification Administration and Test Site Article 34-1

Those who have registered for two or more tests of different job categories 、classes or items held at the same time or same test site, the job categories which the examinees are unable to take will be listed as absent from the class or item of the job category.
中文原文 技術士技能檢定作業及試場規則第34-1條
同一梯次報檢二個以上職類級別或項目,致類科測試時間或試場相同時,報檢人無法應檢之職類級別或項目列為缺考。

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