I am saying that if you really need to do 8 hours plus a week, you are looking at the wrong schools. And that a child who's been tutored like crazy to get in somewhere may find themselves a bit at sea once they are in a group of children who didn't need to do that amount of prep.
They mostly work hard, yes. Some don't! They're mostly also not geniuses and I specifically pointed out that mine isn't.
You may not mean to scaremonger, but you are. I am just pointing out that if you don't have the mental or financial resources to do crazy levels of preparation (or just don't want to, maybe because your child would hate it and mine would have loathed it) it may not necessarily matter that much as long as you are applying to a school where your child is a good fit on ability and personality, and that might include schools that people assume need a lot of extra work.
Obviously this all depends on your own particular child who you probably know best. Some people don't even necessarily decide to apply to selective schools until quite late. We didn't decide to apply to St Paul's until a few days before the forms were due in so we couldn't have prepped for years even if I'd thought that was a good idea. I don't think it's a good idea for a number of reasons and would never have subjected her to hours a week or even an hour a day.
St Paul's is well aware also that downtime is important and they are often at pains to stop their students doing too much. They also think excessive tutoring is not a good idea, and parents are asked to say on the application form what preparation has been done.
The school has not changed much in the last five or six years, I don't think!
I wasn't going to get involved in this again because it's ridiculous, but I do think it's important to counter your strange assumptions because otherwise people might actually think they are true, including people who might come across this thread in the future.
We don't know any girl at St Paul's who engaged in the levels of prep you seem to be undertaking. That's not to say there aren't any, but our personal experience is that we haven't come across anyone who did that level of prep.