I didn’t do the leaving cert (I’m from Glasgow) but in school I done maths, physics and chemistry – so I think you have similar if not the same options!
I loved all the subjects! Chemistry was really good fun, and sometimes I wish I’d studied chemistry further than I did. Physics is very like maths, which I enjoyed.
I think it’s good to pick subjects that interest you. And you probably won’t absolutely love every single lesson you have! But as long as you enjoy the overall course I think it would be a good choice.