Interestingly, a new DC has just joined my DCs class (junior school) as a DC left just before Easter to go to a private prep. On seeing the mother of the new DC I realised I recognised her and it happened that her DC had done a toddler class with mine.
I got chatting to her yesterday and asked which school her DC was in previously. She told me he had started in a state primary. Then moved him to a private prep. making it clear to the school that they were doing so for the 11 plus preparation. The school reassured her that this was something they had a high success rate in and that a large number of children were attending for that reason.
The mother has now moved her DC back to a state school. The reason she gave was that the school continually avoided the issue of measuring performance and were far from clear as to what progress was being made etc. As my DH pointed out, there could well have been other issues which the mother is not prepared to discuss, such as change of income etc.
I would not say that this suggests for one minute that State schools are better than private preps. but could demonstrate that standards differ amongst private schools as much as they do state schools.
From my own personal experience, I have a relative who had a private education in London. They left quite some years ago and are still struggling to decide what to do with their life. They seem completely amazed that I had, in their eyes, a more inferior education, yet managed to have a good job, a loving family and become completely financially independent (they are still living at home).
The impression I get is that some (unfair to say all as this is just one example) private schools direct children in their education to such a degree that they blindly follow the advice they are given without ensuring that their own preferences are mapped onto that advice. An example of this is where Private schools highlight which GCSE's should be taken to lead up to which A Levels they will need to get into XYZ University (admittedly some super selective state schools do the same). The end game is very much directed to the University channelling, hence the higher numbers of privately educated children gaining access to University.
I compare this to my experience where the careers advisor looked at my performance at school, asked about my preferences and then showed me a selection of channels I could take. There was little emphasis on University but there was a lot of discussion about what types of jobs I would be interested in.
Could this be a result of days gone by, where state school provided a means to getting a job and become independent as soon as possible whereas private schools were for the privileged who had the financial backing to allow them to take their time in deciding what they wanted to do and as a fall back would gain employment with the family or through family connections?
It would be interesting to see how many CEOs of the top 500 businesses in the UK had a private education vs those with a state education.
Another point to consider is that comparisons between state and private performance is difficult as private schools are not obliged to report the same level of details (if any at all) in the public domain as state schools, making any direct comparison almost impossible.