The good news from the most comprehensive study ever done of gender and math performance?
'No gender difference' in scores among children in grades 2 through 11. [see research summary]
The bad news?
In most states [the researchers] reviewed, and at most grade levels, there weren't any questions that involved complex problem-solving, the ability needed to succeed in high levels of science and math. If tests don't assess these reasoning skills, they may not be taught. [see CNN article]