You may have a point, my perception of my secondary school experience in a state comprehensive was similar to OMS, with a pinch of physical and emotional abuse thrown in for good measure. So I am not a keen supporter of school education, "another brick in the wall" was my perception.
Yep - the abuse was there as well, in all it's forms - perhaps I should have also pointed out that whilst I went (in part) as a boarder in a public school, I was there because I was a forces brat, not because we had plenty of money - overseas postings got you an allowance for said brats' education.
Personally, I don't hold with all this idea that school influences your life forever - I'm willing to accept it changes your opportunities, perhaps more today than a few decades back, for sure - but what you achieve, is generally up to the individual. Lets face it, up to age 16, and a few O levels only really shows that you may have an ability for learning - it ceases to have any relevance in a few years.
Let the wind blow you, across a big floor.