One of the confusing things about the field of sex differences is that you can arrive at very different conclusions depending on how you decide to assess abilities.

There are several studies in UK to show girls outperform boys at maths until the age of 11. Would also note anecdotally that whereas in my youth during the first quarter of the second half of the last century it was culturally permissable for real boys to study English Literature. Oh, and half the students in my physics class were girls too.