It's difficult - you study the equivalent of three A Levels in under a year. You don't have many exams to study for (so I found it 'easier' than A Levels), however you do have constant deadlines (like every other week) so you need to have good time management to ensure you keep up. This can be quite stressful! I ended up with 42 distinctions so it's definitely doable. I would double check that the vet schools accept Access to Medicine or Vet Science - when I applied 4 years ago they specified that it had to be Access to Science only.
I love Vet Med and I love Nottingham vet school. I can't see myself doing anything else. I think I struggled with imposter syndrome worse than others to begin with - because the Access course didn't have many exams and I started uni during COVID where we had open book exams. I was so so worried that when things returned to normal I wouldn't be able to pass a proper exam. However I've since sat closed book vet school exams and passed, so that just shows that Access does prepare you for vet school!
A full break-down of my work experience for my application is on my profile. I did 10+ weeks of regular placements, in addition two a long-term placement, and paid work at an emergency vet clinic during my gap year.
I never did any MMI interviews so I can't really say what they were like. The Notts one was a traditional panel interview, with practical elements and a group task later on in the day. They asked all the questions you'd expect from a regular interview, to get to know you and see if you fully understood the role of a vet.
For your next steps, I would really recommend doing some work experience at a vet clinic, just to ensure you understand what the role entails is as it can be very different to expectations. One of the biggest issues in vet med at the moment is retention. On average, new graduate vets are leaving the profession after six years. It's an incredibly stressful and underpaid job and many don't quite realise this when they apply. Veterinary medicine has the highest suicide rate of any other profession, so it's really important you research thoroughly what it involves when you apply!
Because of all this, the vet schools are increasingly less bothered about grades and more interested in how much work experience you've done and whether or not you appear to have a realistic view of the profession at interview.
I don't mean to put you off at all, just that you should be fully aware of what you're getting into. Despite all of these factors, it can be an absolutely wonderful profession where you can really make a difference. Let me know if you have any further questions, and good luck with your journey.