Looking at the high end (perfect score of 800 on math), there are a lot more math-gifted boys than girls.
“Specifically, at the highest level of math performance on the SAT test last year for perfect scores of 800, there were 11,098 males and 5,570 females achieving those scores, meaning that nearly 2 males achieved perfect scores for every one female (male-female ratio of 1.99-to-1). Adjusted for the fact that more females (903,719) than men (794,802) took the SAT test in 2015, the percentage of males who earned perfect scores of 800 points was 1.4% compared to the percentage of females with perfect scores of 0.62%. That produces an adjusted male-female ratio of 2.26-to-1 (vs. the 1.99 unadjusted ratio) for high school students who had perfect 800-point scores.”
I would add that I disagree with his fudge factor over different numbers of boys and girls taking the test.
At the high end, every boy and girl likely to score over 700 WILL be persuaded to take the test.