Information about how to get the Taiwan visa for Mandarin in Hong Kong

Hi ,
I’m marvens i will come to study at the mandarin Training Center in taiwan I’d like to know if anyone here know about how to ask for the visitor visa with purpose to study Chinese at Hong Kong, even if I’m exempt of visa for 90 days I’d like to have the visa in case I choose to stay for 2 terms
Thanks

Visitor Visa for Studying Chinese Purpose
https://www.boca.gov.tw/cp-158-260-9690c-2.html

Taipei Economic and Cultural Office/Hong Kong
https://www.boca.gov.tw/cp-192-3735-e1d68-2.html

Taipei Economic and Cultural Office/Hong Kong
Taiwan Visa
http://www.tecos.org.hk/visadirectory

Thanks a lot, you think there’s a reason to be worry for getting the visa even if I have all the documents they ask??