I went to the local state RC primary and then the local comp (which had a decent mix of people and a reasonably good reputation). I was horrifically bullied at both, so my parents moved me after 14 months to a small all-girls selective school.
I did very well at school and was pushed towards academic subjects and Uni. I enjoyed university and left with a good degree, worked and then went back to complete a postgrad.
Then I got married and I have only picked up the odd job here and there (mostly unpaid charity work).
In a funny way, my school was very old-fashioned. No computing lab (this was late eighties, early nineties), Latin and Ancient Greek, Home Economics was a hoot as it included lessons on how to knit and embroider, lay a table for a dinner party, deportment and etiquette etc. Mind you, it had a good academic reputaion as well.
So, when I went to Uni I had to do a remdial computing course as I had no idea how to use a computer to submit my work etc. On the flipside, I married and Army officer and all those etiquette/dinner party/embroidery lessons ahve come in very handy!
In contrast, my husband went to a sink school on a sink estate - it didn't even offer A-levels as no one did them. He had no encouragement from his parents and they actively tried to prevent him from doing his A-Levels at college. He has a BSc and an MSc and is now thrudting his way through a promising Army career. He's way more ambitious than me and has acheived more considering his background.
I think personality and family support are more important factors than the type of school. Some children will thrive wherever they are educated and some won't. Equally, there are are schools that know how to get the best out of their pupils and can contribute a great deal to a person's success in later life.