in normal circumstances, students with Hong Kong qualifications can entry into tertiary programmes within the Commonwealth of Nations freely. Unless you intend to further your studies in Spain then I would advice you to query the university authority.
please note that you will need to legalize your documents with the Apostille of the Hague, find as follows the details and explanation in the web site for it:
Once it is legalized with the Apostille of the Hague you will need to translate all the documents (I attach the list of official interpreters for your information) and legalize the translation in our Consulate General. Should you need any further information, please do not hesitate to contact me.