i don't know about nursing but i'm doing midwifery and i assume the interviews will be pretty similar.
They just asked me why i wanted to do the course, what i could bring to the profession, any experience I had. To be honest it was really relaxed. The interview is really just to see if you'd fit in in the course, they aren't going to ask you any questions about nursing that you can't answer- that's why you want to do the course, so that you can learn.
Just convince them that you are commited to dedicating the next 3 years of your life to the course and you'll be fine.
Good Luck!