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Girls did better than boys at school when I was going back in the 1970s. Then they grew up, got married, had babies, and the men had to go out to work and support them just the same.

I think it's just that girls are more mature and better behaved (on the whole) than boys at school age anyhow. Girls would obediently go home to diligently do their homework (in between cooking and cleaning chores) while the boys tended to dump their books at home after school and go out on adventures.

Not saying that makes boys better or girls better. It's just the way society is set up and how boys and girls are wired. Boys like to be independent and on their own and girls like to be kept safe and be part of a social structure.