Earlier quoted context omitted.
One way of avoiding any exams or interviews is to have your child start at a private school at nursery level - it's only if you transfer in later that they do the interviews/exams (NB not all public schools work like that though). Mind you my son transferred between private schools at age 16 and the interview was mainly about rugby... [NB Both my wife and I went to very humble state schools but we could afford privat…
Your own experience may be of better quality teaching in the private schools but that's not borne out by the evidence, what little there is. For reference, there's the recent publication of "Posh Boys: How the English Public Schools Ruin Britain" by Robert Verkaik, which explicitly states there is no demonstrably better teaching. My own personal experience is of State, Grammar (selective) and Private. It's all about…
However also anecdotally a friend taught at a private school for a couple of years. Parents made it quite clear that it was his responsibility to ensure their angels passed the exams, no matter how thick they were. He didn't stay for long due to that attitude.