See also the research showing that schools have become heavily biased against the success of boys.
Life favors thinking and creative problem solving, school favors regurgitation and submission to authority.
As an example my son doesn't do to well in math, however, he's been multiplying/dividing since Kindergarten. My daughter at least appears weaker (I think she's hiding her skills) but does much better on math at school.
Don't pay too much attention to statistics, bring your concerns to your administrators. They have a lot of work to do and don't need parents making complaints and creating extra work.
Note here (from a girl) remembering my childhood and maths: my interest in all things technical came to life when my father (figure) showed an interest in playing chess with me, and in building things like aerodynamically-interesting paper/card planes, rocket launchers and kites.
I can't wait to teach my kids.