Year 8 students from Victoria College have taken home the trophy in the 2022 de Putron Challenge.
The annual inter-islands quiz sees school children put their knowledge to the test.
The team beat Blanchelande College, which came out on top in that age group's Guernsey heats last month.
In a post on the school's Facebook page, Victoria College's team captain said:
"It’s fantastic that we’ve won. We were fortunate to have brilliant support from the audience."
Earlier in the day, pupils from Les Landes School narrowly missed out in the Year 6 age group, with Guernsey's Forest Primary School coming out on top by a single point.
Charlie Manners, Jack Steer, Callum Cunningham represented Les Landes School
Hayley de Putron, a Trustee of the Ana Leaf Foundation and founder of the de Putron Challenge, said:
"Congratulations to Forest Primary School and Victoria College for winning the inter-island final in their respective year groups.
The teams did so well and everyone who took part should be very proud of themselves.
Thank you to everyone who got involved and contributed to making another fantastic year for the de Putron Challenge."

'Show up and play' football games to tackle festive loneliness
New website helps children and families navigate the digital world
More time in Jersey for French day-trippers
Rapist jailed more than two decades after his crime
Jersey Airport to see 20,000 passengers in the run up to Christmas
Both winning CI Christmas Lottery Tickets sold in Jersey
Jersey churches host free Christmas events in the Royal Square
Support service set up for carers of people with mental illness