Studies have found that this is not completely true. US kids who have parents who volunteer at school (like PTA) actually have poorer academic achievement on av

Studies have found that this is not completely true. US kids who have parents who volunteer at school (like PTA) actually have poorer academic achievement on average than parents who don't. They have also found that the smartest kids in the world have parents who are not terribly involved at school, at least compared to their US counterparts. The strongest correlative of a child's academic success in the US is the income level of their parents. (source: The Smartest Kids In The World http://www.amazon.com/gp/product/B0061NT61Y http://www.amazon.com/gp/product/B0061NT61Y)