Certainly in my childhood and young adult life there were a number of factors to my success or lack of it that had nothing to do with which school I attended. I think the main factors to my economic success was being taught to enjoy reading at a young age by my parents. I have always devoured information and through that have made a career without any qualifications.
The emotional/social success and general happiness I experience is a little harder to point to a source but certainly didn't come from the shit hole high school I attended. I generally attribute it to my parents teaching me what to value and growing up in an emotionally secure environment.
This security and parenting happened even though my parents fought each other constantly and divorced in my early teens. The were both dedicated parents who presented a consistent set of rules and values.
Of course I could just be on the further end of the bell curve?