In last week's finals, GSIS defeated Chinese International School to win the gold division by opposing the motion "Whistleblowers make the world safer".
Island School beat La Salle College for the silver division honours, opposing the motion "the war on drugs should be ended".
Raimondi took the honours from Shatin College when they opposed the motion "Hong Kong should ban all forms of gambling".
Best speakers were: German Swiss International School's Caitlin Fischer, Island School's Brian Wong and Raimondi's Isaac Chung.
Hong Kong Schools Debating and Public Speaking Community organised the event.