The English so called "public schools" (meaning schools which were originally founded to educate the clever children of the general public) at some point were taken over by the very rich.
It is a moot point whether, in spite of huge advantages in terms of facilities, class sizes and other resources, the products of these schools are, in any real sense, better educated than children who have been educated within the state system, which is usually comprehesive.
What is obvious, however is that the products of these schools aquire certain advantages - an innate (and quite unjustified) sense of superiority- and , most importantly a good network of contacts which will give them a great deal of help in their future careers.
"OK, I know you did not get a very good degree, but would you like to be an unpaid intern in our stockbroking firm?"
"No problem, Mummy and Daddy will fund me and we already have a flat in London"
That's how it works.