I'm starting my degree in September (got my A-Level results last week LOL) but did tonnes of research into nursing because I was discouraged from it due to being male and doing academic A-levels. I really enjoyed my work experience in a care setting which is what made me want to pursue it.
Every uni interviews their prospective students, but not everyone gets offered an interview.Don't be disheartened though. At some unis you are fighting off 8 other applicants for your place there!
Some uni's do maths and literacy tests others don't. It's fairly simple if they do however, they just look at the legibility of your writing and your articulation etc. Numeracy tests are usually easy but make sure you know how to convert from micrograms to milligrams etc. as sometimes they put basic drug calculations on the papers which caught some people at my interviews out. Also othings like 1 gram= 1000 milligrams.
As for the interview? Just be yourself that always works if you have aptitude. They ask all sorts of things, but they'd never ask you anything medical related like "What is nephritis?" there more about "what qualities do you think a nurse should have?". The might ask you "what you'd do if someone say refused to eat their breakfast on a ward round" but often it's common sense really.
Don't worry they're always really nice at the interviews! The interviews are fun and you'll meet loads of like minded people
The staff know people get nervous and don't be afraid to tell them that they're so reassuring and lovely- they are often nurses themselves after all so this shouldn't be a surprise.
It's the group interviews you've gotta watch out for (most unis do individual in my experience), you might get some big-headed tw*t interrupting you or speaking over everyone- don't let them do that make sure you have a voice.
Above all remember they WANT to offer you a place on their course just show enthusiasm and passion for it and try and talk about any work experience you have in healthcare. Another professional touch is to shake the interviewer(s) hand(s) after the interview. This shows professionalism which is crucial in nursing practice.