The interesting study by Fordham Foundation on what happens to high achieving middle schoolers as they transition to high school (an alarming number take a performance dip) can be broken out by gender, as U.S. News shows.
We already know that lower achieving boys suffer most during that transition, a phenomenon known as the 9th grade bulge.
Now we know something similar happens at the top end. From U.S. News:
Although minorities were underrepresented among high achievers, high-performing minorities tended to stay more stable than high-performing white students. Boys' performances suffered more often than girls' performances during the middle-to-high school transition, as the proportion of high-achieving girls grew from 49.8 percent to 52.6 percent in reading and from 39 percent to 41.7 percent in math.