Need advise from a primary school teacher ASAP!!!

Am

Im in third year (in ireland) and im ment to be doing ty but i sent the application form too late so now i am on the waiting list and might not get a place. I was told to chose my subjects for fifth year in case i dont get in but i only have one day to chose. I want to be a primary school teacher but i dont know what subjects i need. Can someone tell me what subjects would be useful to chose or that is essential?