After analysing school A-level results of Jags, Newstead, and Eltham college, including (subjects), I found it very interesting that Jags and Eltham have similar A* -A % rates much higher than Newstead. But Newstead has a similar amount of candidates (12-16) who went to Oxbridge every year with Jags and even more top London universities in London. Eltham only has 6. I mainly look at 2022 data. Newstead also has very diverse A-level subjects and Uni offers. They all have different strong subjects.
I try to understand that because Jags have some oversea studies (like the US) and more arts college offers, or Oxbridge likes state study candidates more. Also, The Oxbridge rate seems relevant to A-level results and a school programme which helps the application or advice. The above makes me wonder if there is any academic gap between grammar schools and selective independent schools. Some top grammars also have good clubs and activities—maybe not good facilities.