I was administered IQ-like tests as a 5 year-old and supposedly rated well above average. All my black classmates performed better in school than I did. They had more self-discipline, more curiosity, more whatever it takes to perform in an academic environment. They are doctors, lawyers, bankers, and other professionals today. What's more their achievements are impressive when you consider the lack of access to social networks like mine and many of the other systemic obstacles they've had to overcome. Their parents made damn sure they got an education, as they had come out of the Jim Crow era and understood an education's value better than most. I knew that was bullshit even then and I'm quite sure of it now.
Dating back to the Enlightenment, scientific or biological racism is nothing new, but people are not inherently racist. Inherently tribal and in-group oriented maybe, but not racism. Race is an invented concept. Racism was created as a way to justify capitalism's exploitation of indigenous peoples of the Americas and African slaves. Sure, create a system that willfully deprives people of education, money, freedom, from one generation to the next, and then devise a test that tests for "intelligence". Color me shocked when the people who've suffered actual deprivation don't perform as well as a group on said tests, which in the end, as I alluded to above, really don't mean shit anyway.