Hi Fiona!
To be honest I haven't ever heard of it being done this way round. Usually colleges ask that nurses have at least 6 months experience in surgery before they start their courses, but I think that may just be so you know a bit more about it before being thrown on to the course?
I started working as a DN at 16 and didn't started my course until I was 18. This was because at a young age I didn't want to do the course on my own, all other nurses did it with at least one other "trainee" so I waited for the next girl to start and we did it together
I personally feel that working full time would be better as you will gain more experience quicker but if this is what the college and the practice have sorted between them then I don't see why it can't work.
Good luck!