I went to a UK $GOOD_UNIVERSITY, and before that, a "good state-funded school". The sum total of coaching for the interview was one mock interview with the head

I went to a UK $GOOD_UNIVERSITY, and before that, a "good state-funded school". The sum total of coaching for the interview was one mock interview with the head of chemistry and the deputy head - neither of whom had been to $GOOD_UNIVERSITY themselves, or really knew what the interview would be like. Still, they did their best, and i appreciate that! Somehow, the school still got ~10% of each year into Oxbridge; i suppose that's the power of selective admissions.