I assume you meant int*rview lmao, one of the ones I had with an Irish school was very odd; it was completely informal, 15 minutes long and for the majority of it, my interviewer was on the phone.
The next one I had was a totally normal: formal, informative, the whole nine-yards. I prepared for both in the same manner; I'd suggest you have a grasp of why you want to study in Ireland, do some research about the school and have some good answers for why you'd want to be there. Additionally know why you want to study medicine, not necessarily what type but just why. Lastly, I'd suggest you have some questions for them: try to keep your questions relatively on topic, the area, the school. I asked something along the lines of what was my interviewers favorite aspect of the school/program and seemingly, that was a helpful question. Might be helpful to google up your interviewers C.V./background.
Also, I did ask about COVID accommodations which is probably one of the more common questions right now, but I did receive an unexpected but really great answer to it so that could be beneficial for you.
In all though, Easter egg hunts like these are supposed to be more of a conversation. Just be you, have a general answer for certain questions, but also have some questions and be willing to converse with your interviewer.
Best of luck, hope this helped!