For 11+ results in our area the wealth/tuition/coaching argument would just about hold up well if it weren't for one of the midtown schools which does well on the tests annually but isn't in an affluent neighbourhood. It's true that many of the neighbouring schools are in affluent areas of the town. And it's true that our catchment school is located in a deprived and socially troubled region. But there is an affluent area within the catchment and the 11+ results don't reflect that. And what's more the mixed intake school which neighbours it outperforms it by an order of magnitude at 11+
Put simply it under performs all of its neighbouring schools regardless of where they are situated and this, although it will be affected by the incomes of its families, this alone can not explain the extent of its under performance.
I suspect something in the ethos of the school neglects the exams. If the school has a tradition of doing well at the exams I'm sure it will expect to continue doing so. One of the academic heads actually mentioned his school's tradition of doing well in them. Although he did mention in passing parents buying tuition, perhaps not wanting to be seen to be taking all the credit.
Whereas when I asked about the exams at our catchment school I was given some answer that I didn't quite understand about being told if our children were not ready. And then the subject was dropped. It was only after I read on the LEA website how far below all of the neighbouring schools our school was that I began to see why our school didn't want to talk about the exams.