@belgarion005 I think they fit a similar academic profile in that they take a wide range of abilities. One measure is to look at leaver destinations. They send children to a wide range of schools at 11 and 13 and work with parents to identify the school of best fit, including their linked secondary. I actually much prefer schools that have children going to multiple schools as it shows they know the needs of each individual as opposed to focusing on getting as many into the top academic schools to bolster reputation.
https://cdn.thomas-s.co.uk/wp-content/uploads/2023/09/Leavers-Offers-and-Destinations-–-Kensington-SEPTEMBER-2023.pdf
Top academic schools would be the St Paul's schools, City Boys and Girls, Westminster, Godolphin, Habs Boys and Girls etc and top boarding schools Wycombe Abbey, Brighton College, Eton etc
Chepstow House has a similar profile. Devonshire House is more north London focussed but again largely similar. I don’t know much about Newton Prep.
You’ll also notice that the most academic schools tend to be single sex. The majority of my expat friends just can’t get their heads around this as a concept.
To add that most children will make their own way to secondary school from 11 so leaver destinations also reflect the residential addresses of the children at schools like these. Devonshire House is more north, Thomas’s is more central and south.
I, personally, like schools that keep your options open. Somewhere like Thomas’s gives you the option of moving or staying put.
But honestly, the best thing you should go on is gut reaction. How do you feel when you walk in the school, do you like the head, what activities do your children enjoy outside the classroom and does the school do this well or have the facilities for it, do they have interesting trips, how involved are parents, what’s the journey like, what’s the food like, is there wrap around care etc. If you get this right then your children will be happy and more likely to succeed.