> Being a good student is largely a function of intelligence and conscientiousness, which is largely a function of parental intelligence and conscientiousness
Only partially - only ~40-50% of a person's IQ are a result of parental genetics [3]. The rest is a result of the environment in which the child is raised - and there are very important factors at play that directly correlate with income of the parents:
- Does each child have their own, adequately sized, room with a study desk to work in and concentrate? During the pandemic it turned out to be a real problem that children who had to share rooms had issues following streamed lectures.
- Are the living conditions actually healthy? Poor people are often forced by their poverty to live in decrepit conditions: noise from highways or rails, toxic emissions from nearby factories, general issues with toxicity (paint, lead water pipes, mould). All of this has direct outcome on performance of students.
- Do the children, particularly those of working age (14 and above, but especially 16 and above) have to work actual jobs to make pocket money or contribute to household income?
- Are the parents largely absent from their children's lives because both parents have to work full-time or worse jobs just to make ends meet?
- Can the parents invest time and money into furthering their children's education? Can they sit together with them in the afternoon/evening and work through homework problems? Can they afford side education, playing instruments or similar activities that have been shown to have a positive effect on education?
- Do the parents have enough money to feed the children? Hundreds of thousands of students alone in New York depend on schools handing out free lunches, which turned out to be a massive problem during the pandemic [1].
- Poverty causes stress - not just from being cooped together in too small living spaces, but also in food insecurity, increased fights between parents over the stress, or in the worst cases from literally being homeless [2].
[1] https://www.foodandwine.com/news/new-york-city-school-childr...
[2] https://www.nytimes.com/2021/11/08/nyregion/nyc-homeless-chi...
[3] https://en.wikipedia.org/wiki/Heritability_of_IQ#Molecular_g...