I admit I know nothing about the world of super selective primary (or 4-18) schools in London and I am genuinely curious to learn. I don't live anywhere near London, nor do I have any concerns about the state schools near me so this is just about wanting to know more and not derail other threads on the subject.
Can they really pick out the best children at age 3? I'm thinking of my own child here. They are summer born but love sitting doing 'writing' more than any child they know (although my friends are more of the belief that small children should be outside so don't know how telling that is). Despite this, they definitely can't write their own name yet. They can only write the numbers 0 and 1. They can recognise about half the letters of the alphabet by their phonics sound. They're polite and enjoy circle time/stories/singing at nursery but not great at talking to new people. So overall I very much doubt they'd be selected for one of these schools.
The thing is, I was the same and then incredibly academic at school. All As and a first class degree with little effort. Learnt instruments and played sports to a high level. My husband was very similar. I think it's very likely therefore that our daughter will be fortunate enough to be pretty academic. I'm now a teacher and have no doubt she'll thrive in Reception. But an outsider wouldn't know all that or see all that. Genuinely, how on earth do they go about selecting children at 3 who they really think have the best chance of succeeding? And do these schools take a high proportion of winter borns?
I know parental engagement is basically the biggest indicator of future success but I guess that all children applying would have invested parents!