You can apply for the "Occupation Skill Appraisal Certificate of Room Attendant" (Level 5, Level 4 and Level 3) at the Occupation Skill Appraisal Institute of the local Ministry of Labor and Social Security;

If you have a certificate of oral English (hotel situational English) above Grade B, it is recommended to work in a five-star hotel.

Of course, the work of room attendants is very hard, and some hotels have no certificate requirements for candidates. If you have a career goal, textual research is still very beneficial.