Although I agree, that's no proof that they're smarter, just that they're better in IQ tests or the educational system. But in the end the educational system decides about your career chances and women are simply better than men in that field.
If that were so, then most enterpreneurs, inventors or CEOs should be almost exclusively female? Oh, wait...
From my experience in managing people, when you assign someone work:
- women will do what they are told to do, exactly and dilligently. Result: high quality work.
- men will immediately start thinking how to make the job easier. Result: a mix of decent work, complete mix-ups and breakthrough inventions
So it's completely expected that women score higher in scholarly and IQ tests, because both measure ability to regurgirate acquired information / skills. That, in turn, is directly proportional to the amount of time spent dilligently studying -- something that women excel at, compared to men, which quickly get bored. But once you go outside the school environment, it doesn't really translate to anything.
It all goes back to the hunter-gatherer society where the selection pressure was on hunters (men) to be inventive and gatherers (women) to be patient and dilligent.