I hate to be so "black and whitish" about school but I for one hated it.
It was like a bad cartoon on repeat.
Living purely for a social life's short sighted, yeah, but not knowing how to socialize with others is a form of being social stunted. It's like when you adopt a puppy from it's litter too soon to a home with no other dogs, they'll behave differently.
Someone who doesn't know how to interact with people is likely to feel isolated and cuss out others for having an easier time succeeding where they fail at life. 
Homeschooling's still a thing, as is private schooling. With the way of the times homeschooling seems to be trending more and more thanks to the bad rap public schooling is getting and technology like tablets becoming more education-oriented with time.
School's biggest purpose if you ask me is helping kids learn to socialize among their own kind. The ones kept to themselves tend to have more... problems down the line since their social errors blossomed instead of being properly corrected by their peers.
There's also nothing stopping you from studying ahead and sleeping through classes (save for participation grading anyway).
School system = Brainwashing system.
Nothing says Education like threatening to arrest a child's parents for not sending them to schooling.
Literally, that's what happens in the UK. If you refuse to give your children to be brainwashed by the state into mindless trend following and conformity, you are held liable and sent to prison because of your child's non attendance.
That is just one of many examples as to why we live in a totalitarian state.
If you refuse to be subjugated into a life of toilsome work on subsistence wages, you are threatened and harassed by the government.
I refused many times, at school their was stupid, conceited, vacuous, trend following conformists who couldn't produce a thought for themselves and could only regurgitate and follow orders. Then there was teachers, having gone through the same process, incredibly one sided to the side of the establishment and never gave a fraction of their hearing to the weeps of children. They didn't care, they would make up lies to discredit me and humiliate me.
I set the place on fire. I watched whilst it burned, that entire classroom was up in flames as I sat shaking with joy and happiness at the justice I did.
Every single school system I went to were all the exact same... Conceited and vacuous idiots obeying conceited and vacuous idiots. If I deviated, I would be held in solitary confinement away from the other children in fear of my insurrectional thinking spreading.
The "Naughty children" were sent to a solitary space or told to stand against the wall or facing it. I never obeyed, I simply left and even had to fight my way out against "teachers." My freedom was all I cared about, every single act to restrict my freedom was deplorable to me, i fought for freedom.. Not only of myself, but for everybody who is stuck in this terrible and atrocious prison of mind.
One time, I was reading a book by Lenin and they took it off me and told me to stand against the wall, I spit in their face and told them to fuck themselves until death. I was immediately expelled like many other times.
My parents would get stressed, would be unhappy and sad... All of this wasn't made for an independent thinker, it was made to squeeze out critical thinkers into the peripherality and fringes of society. I would spend every second of my life at home reading, studying stuff that was, according to the school system, years above me... I realised the mind was a tool of divinity, and that any insult to the mind was an insult to God himself.
IT SHALL BE WRITTEN DOWN IN THE HISTORY BOOKS: That the capitalist system, born out of slavery, blood, rape and genocide, and only maintained its survival through force, arrests, keeping people hungry, genocide and glutton at the expense of everybody else, shall be viewed as the most atrocious and evil system of all humanity. It's crimes will have the future cry, cry at how we were treated, cry at the slavery, the crime and the war... Cry at the totalitarianism and authoritarianism and how brutal, despotic and repressive the regime was.
Before attacking people with semi valid point with blatant, dull personal attacks how about you answer to my points on your long waste of a thread about your little issue with "economists of our time".
This thread is no less smoke and mirrors with some rhetorics involved than most of your threads. Although school may seem like prison for children with ADHD or some other disorder preventing them from acting in a "normal" manner it is hardly a "prison of the mind". When I went to school there were plenty of people practicing non conformist ideologies, the idea that you would be held in solitary confinement for "insurrectional thinking" is absurd. School is for many a melting pot of ideas and crucial for someone to form their personality. Even though you seem to deem "having a social life" as something distracting from "the mind" for many people who are not social outcasts and delusional such as you, these interactions at an early stage in life help them tremendously through establishing relationships and personal development.
Now I think you hit an important point with your last paragraph (before that underlined rambling monstrosity at the end) no school system is perfect. But in todays society the overwhelming majority of peoples talents are allowed to flourish. The idea that you were "too smart" and studying things "above your year" and being punished or deinsentivitied from doing it is absurd. Also if it was so easy finish it! Move on to the things you find interesting, math is one of those subjects where anyone can jump grade boundaries and do higher level things and I think it applies to most subjects in school.
Now here comes what I see as a step in the right direction for you, after realizing you were a mediocre student and a disappointment to your parents, you resorted to "divinity" to take it's place, sense you could not cope with the fact that people looked down on you and that you had NO TANGIBLE things to be proud of.
Now give us some examples of things you were punished for thinking, I'm sure your school had communists, anarchists etc.
You are delusional. "Its the system not me"