In school I chose accountancy - which was obviously relevant to my career. I also chose French, Physics and Geography - just in case accountancy wasn't for me!
When I finished my Leaving Cert, I chose the Accounting and Finance Degree in DCU and the Masters in Accounting after that. These courses were relevant for my chosen career, due to the fact that while studying to become a CTA by doing the Irish Tax Institute exams, I also qualified as a Chartered Accountant. In hindsight, I would not have chosen differently.