An interview was indeed a nice experience!
I applied to Leicester, Birmingham, and UCL. I had an interview at Leicester, withdrew my application from Birmingham (personal reasons), and am yet to hear back from UCL!
My interviews were both purely scientific. I cannot discuss the details (signed a form and all), but there was little of the typical interview questions you'd hear. I had to discuss scientific concepts and ideas, and for this a very thorough background knowledge is needed. According to their feedback I was quite confident in my interviews, and I think the only reason I did come across as such was because I revised all of biology and chemistry that we have covered at school.
I did a lot of random stuff to be honest
I did a sort of an EPQ on medical synthesis and its implications on pharmaceutical costs, volunteered with disabled children, volunteered with kindergarten kids, and did a few placements (a bit over 2 weeks total) with plastic/hand surgeons (my personal interest). The type of interviews you receive differs depending on the college you apply to, so make sure to check out what the college you're interested in says. You might not be asked about your PS if the college doesn't have a general interview. For my ECs I talked a bit about my passion for languages (I speak four) and my interest in literature
Nothing super crazy on that side, really.
Work on your BMAT and just try to enjoy the thing would be my overall advice. I didn't get in, but I met so many cool and nice people both on TSR and during my interviews - I talk to some of them almost daily and they're such amazing people. I think it's easy to get caught up in the idea of getting into Cambridge, but it's honestly not be-all-end-all. For me Cambridge was a bit of a stretch, and I always wanted to go to UCL, so if I had gotten offers from both the decision would've been hard. But still, I put all of the effort I had into my application, and I don't regret a thing. The feedback I got from my college was positive, and was (ironically) a confidence boost - it's not I was awful and an absolute waste of their time ,it's just that others were a bit better here or there
Also, wearing a huge smile always helps. Honestly the time flies so quickly in these interviews, it's crazy. I had such an amazing time and wouldn't mind going through the process again if I could (well, the interviews at least - they were seriously my favourite part!).
Good luck guys! If I do take a gap year I might see you around. Who knows where this year will take me