It also won’t help the state sector because the biggest problem is parental engagement not lack of funding .
I went to a state primary school and it was mixed socio-economically. The smart (or even average) kids from middle class and/ or educated backgrounds who did quite at primary school did well in high school and went on to uni or started businesses etc. the smart kids from backgrounds that had parents that did not value education mostly got pregnant /fathered a kid young or went into some unskilled low paid job . The difference was so stark once children got to high school they started following different routes/crowds.
My single mum didn’t have money for fancy trainers so I could be cool but she found money for tutors to help me in maths which I struggled with. My friend in comparison will buy smart phones for her kids (outright not a contract) and then look wide eyed and confused at the idea of paying for anything educationally (tutors, revision camps, extra books etc ) when her kids are saying they are struggling with work.
I know this is all just anecdotal but I’ve also seen this many times working in schools and statistics also back this up, it’s the main reason why schools with the most middle class or educated parents do well. That’s why children of low income immigrant parents often do better in education than non-immigrants kids whose parents earn a similar low income.
We need to start looking at socio-economic reasons closely. As pp said everyone at state school doesn’t mean equal footing or some nonsense. Some kids will have tutors, enriching experiences, encouragement at home to value education etc and some kids won’t.
Don’t get me wrong I think funding can offset some of the “harm” done by coming from a family where they don’t value education if it’s targeted into intiatives that aim to change mindsets, but it will only do so much. There needs to be a cultural shift overall.