It’s not only 7% of children who attend independent schools. By 6th firm it’s 18% nationally.
Here is the difference. Of the many thousands of state schools up and down the U.K., only 163 are academically selective (ie grammars). Even within grammars, some of these are in areas such as Lincolnshire and so not particularly selective as the population pressure is relatively low compared to more urban areas. For instance, the chance of getting in to a grammar in the Wirral might be 40%, whereas somewhere like Tiffin Girls in Kingston it might be about 5% as thousands sit the entrance exams every year.
Of course there are state schools that select by faith, but I’m purely talking about academic selection processes here.
I don’t know how many independent schools there are in the U.K.. They will vary massively from the big name boarding schools with rolling grounds and all sorts; to small preps and schools crammed into Victorian houses in city centres.
But what you can say about independent secondary schools is that, unlike comprehensives, they will invariably be academically selective to some extent. For some in rural areas the odds of a place may be 50% or so. But in the case of the London Day Schools, for instance, there may be 1500 siting 11 plus for 100 places. These schools are super-selective and there are a lot of them. I’m not sure people realise that it’s harder to get into some of these schools (relatively speaking) than it is to get into Oxbridge!
So forget the ‘private tag’ for a moment and the assumed privilege that goes with it. Instead, it’s obvious that the more selective a school is - regardless of the sector - the more A* it will produce and the more top uni applicants it will field. This is hardly rocket science.
It’s to do with the aptitude of the students - not so much the teaching. Of course there still be bright children in every school everywhere. But people with an IQ over say, 135 are in the top 2% nationally. So in an average, non-selective school, that’s what you would expect to find. But a school like St Paul’s Girls, they will all have IQs of 135+ because this is precisely what the entrance exams filter out. You can’t buy IQ - nor can you buy a place at these schools. They don’t care who you are or what you do. They want the brightest kids and they can cherry pick them and that’s how they get nearly a full house of A* grades year on year on year.
So it stands to reason, that even though only 18% of sixth formers are in independent schools, selective schools will always punch above their weight in terms of uni applications - because selective independents (and grammars) only take that type of student in the first place!
At the moment, about 75% of Oxbridge applicants are from the state sector. True, many of these will be from grammar schools. But 18% of independent applicants achieving 25% of places is probably what you would expect, based on selectivity at 11 plus or 16 plus.
But wherever you apply from, your grades are contextualised in the context of YOUR school.