Hey! I got an offer for the course. Interview was easy peasy - they just asked me what are my plans after the course, which universities I'm planning to apply and if I've been working on my UCAT yet. The tutor asked me also if I have any relevant experience that is needed by universities.
As for math test - it's done at the beginning of the interview. You have few questions to do. I think mine had 15 marks in total. You can use scientific calculator.
I might be wrong, but I think if you will not pass the math test then instead of interview for the course they will present you with other course options (at least it was a case last year, when I've applied for SWAP Life Science).
There is also 2nd interview with a lady from SWAP. Mine is on Tuesday, so I don't know how it will look like. But I've been told it will be similar - she will ask about plans after course and it would be better to have strong reasons of why you want to study this course.