Well, the tables in the link do not support that. And the studies. I just put the topic title in simple terms, as dark skinned people are the majority in those areas. But if you are white and born and raised in those areas, you would suffer the same fate:
Most strongly correlated, to score high on test, was income and education, then temperature of areaNo racial dependences
None of the studies used here, conclude that the intelligence quotient is influenced by a particular race. In some cases, differences within population groups were found (e.g. in Basil: Blacks 71, Mulatto 81, Whites 95, Japaneses 99), but all differences could be attributed to their origin, level of education or other factors.
In 2006 Donald Templera and Hiroko Arikawab found a connection between increasing skin pigmentation and a decreasing IQ. Even this was not racially dued, because the pigmentation grade is climatically conditioned. The observations were also made within the same groups of other races, e.g. caucasians.
Gambia IQ 60 income 534 $ education spending 11 $ temp 32.8 °C