Oh, and I agree about even uneducated, non-English-speaking parents being able to find resources and after-hours study for their children. That’s a big part of their success.
Many upper-middle-class parents have smart enough kids with ‘good enough’ schools in the ‘burbs and wherever, however, so they can succeed without parental involvement.
In all the families that I have dealt with over 30 years of a career, and as a volunteer for our church, I personally, have never seen a child excel academically, or even learned to read fluently and mastered fractions and decimals, who has not had a parent who afterschools. This is merely my anecdotal observation.
I have know **adults** who, having done very poorly in K-12 schooling, have ( as mature adults) excelled academically even going on to attend one of the highly competitive health professional schools ( medicine and dentistry).