Regarding success, the biggest stumbling stone for middle class native white British people and their offspring is their sense of entitledness. It makes them complacent
I do agree with this. I teach a science subject at A-level, and obviously teach students who want to go into medicine/dentistry/vet med etc. Many universities obviously have requirements around GCSEs, work experience etc, as well as admissions tests and A-levels.
Every so often, I or a colleague ends up having a conversation with a parent saying actually with grade 5/6s at GCSE, and a lack of work experience, no, they probably won't get into university course X. And some parents are absolutely insistent there must be a route in, when their child has dossed about and underachieved for years.
The children have never really been allowed to fail at anything, but they hit a certain point where actually their parents can't smooth the way for them any more, and whatever natural ability they may have isn't actually backed up by exam results etc.
Or equally students who want to apply for any course with AAA entry requirements, got Cs all year in Y12, and now they're annoyed I won't predict them a grade A. (There's always an excuse, for the poor performance, too).
The students who really want it tend to be pro-active and self motivated, rather than falling back on excuses- but I think generally they have been taught that.
I do also agree with the idea that white brits are very tied to the idea that intelligence is fixed.
But also PPs are right- you do need to look at school funding and parental social class/income as well.