Children of similar cognitive ability have very different chances of educational success; it still depends on their parents’ economic, socio-cultural and educational resources. This contradicts a commonly held view that these days that our education system has developed enough to give everyone a fighting chance.

Source: Educational success among children of similar cognitive ability depends on their background

Although the study is based in England, it does lend credence to the issue that a lot of educational and societal woes have problems outside of a school day. Schools are doing an amazing job, but there are limits to what they can do.