From The London Times:
IN THE late 1990s the US Department of Education undertook a monumental project called the Early Childhood Longitudinal Study (ECLS). The wide-ranging ECLS data offer a number of compelling correlations between a child’s personal circumstances and its school performance. For instance, once all other factors are controlled for, it is clear that students from rural areas tend to do worse than average. Suburban children, meanwhile, are in the middle of the curve, while urban children tend to score higher than average. (It may be that cities attract a more educated workforce and, therefore, parents with smarter children.) On average, girls show results higher than boys, Asians show results higher than whites, and blacks show results similarly to whites from comparable backgrounds and in comparable schools.
Matters: The child has highly educated parents.
Doesn’t: The child’s family is intact.
A child whose parents are highly educated typically does well in school. A family with a lot of schooling tends to value schooling. Parents with higher IQs tend to get more education, and IQ is strongly hereditary.