To be very clear about it, this is all the more impressive because Nigeria is, by and large, still a pre-industrial society. The differences in basic worldview and outlook (including attitudes towards education) brought by industrialization and modern economic development (often misattributed to "Whiteness" in divisive political rhetoric) are absolutely huge and easily overwhelm any model where "skin color" or "genetics" exogenously determine these outcomes. This is easily ascertained by looking at how individual countries in the modern West industrialized over time and went through these very changes in culture. The skin color of English lower classes did not change much from the 17th to the mid-19th century, but their culture absolutely did.