It's not a course requirement, it's a university requirement. It is because Irish students must present Irish, English, Maths and a third language until Leaving Cert level- in fact it is lucky you don't have to present one at A-Level level. Trinity, UCD, UCC, NUIG and NUIM certainly will not let you matriculate. UL (University of Limerick), DCU (Dublin City University) and DIT (Dublin Institute of Technology) I can't be sure about. Is there a chance you can do say GCSE French or Spanish externally? My cousin dropped French for LC stupidly and had to do it externally but they allowed it. That way you would be elegible for EVERY university and college here. I would not advise checking course requirements first as it is basic matriculation requirements for the universities that this issue concerns.