First of all, congratulations! It's an excellent outcome. Many nappyvalley families would love to be in your position!
I have a child at Chestnut. First impressions are good but it's too early for us to tell for sure.
The families who like Chestnut tend to do so because they find it a reasonable balance between rigour and reasonableness: many would find schools like Ashcroft too strict, schools like St Cecilia not academic enough, but find Chestnut a reasonable balance.
Many families who don't like Chestnut prefer stricter environments (Ashcroft) and/or schools which have higher GCSE results (Ashcroft, Graveney, Harris Wimbledon, Hurlingham in Fulham) and/or schools which apply streams or apply sets in more subjects (same list as before).
Graveney is a very big school: some find it overwhelming, some prefer it as it's easier to find your crowd in a big school.
Something on which opinions are divided is whether Graveney is two schools in one: some say the selective / grammar / whatever it's called stream is mostly rich white overtutored kids, whereas those who get in by distance are a different demographic. Other people disagree, point to all the stats that white kids tend to be less represented in selective schools (on the basis that familiar values count more than wealth itself), and suggest that Graveney's very good results overall could not be reached if it were really two schools in one.
I am not sure about the details, so double check yourself, but I think that:
- Chestnut uses sets for maths only
- Hurlingham and Graveney use streams
- Graveney's top stream is a combination of the kids who got in with the test + the top kids who got in by distance
What schools do about sets is maybe one of the least clear points from their websites, so, if you feel strongly on this, do look into it.
I have tried to present what I understand are the more common views on those schools, without taking sides - it's up to you to do your due diligence.
How much harder would it be to get to Graveney vs Chestnut?