Girls Outperform Boys in Graduation Rates

Does this neccessarily mean that schools practice anti-boy gender bias? Or do alternative explanations exist, such as girls behaving better?

With Asians out-performing honkies, does this neccessarily indicat anti-white racism permeating American education? Or do alternative explanations exist, such as the better behavior of Asian students?

With black students performing at the bottom (even in school systems dominated by black teachers and administrators), does this neccessarily indicate the work of racism? How is it that the same black schools charactorized by poor academic performance regularly produce top-notch athletic performances? Could it be that black folks overall are behaving on average poorly when it comes to academics, but seriously when it comes to athletics?