If you are poor the chances are you live in an area with mostly crap schools. And that can include crap primary schools too. If your parents have some dosh, they can move to a catchment for a better school or even send you privately.
My parents rented a house till I was 15 and worked all hours. I got to Grammar School and, like many of my class mates, it moved us out of wage slavery and renting into university, prof qualifications and good prospects.
We still have Grammar schools round here and I hope The Boy gets to one of them!