You havent stated what kind of work? Dancer/ Youth Leader/ Waiter/ Cabin Steward/ Deck or Navigation Officer.... etc, etc. (The list could be endless). You are at the right age to focus your learning on the skill needed for any career. If you want to be a deck or Navigation officer you will need a mimimum number of GCSE and A level Grades. Lots of cruise companies have links on their web sites to a careers section. Also if you google Cruise Ship Jobs it will give links to companies who act as agents for Cruise Ship Job vacancies. Good luck.