Along with IQ there are 2 other psychometric traits that have significant and substantive predictive value for Academic and Occupational performance. These traits are also significantly and substantially, genetically heritable. There're predictive polygenic scores for these traits. I suspect they have an impact at the population level as well.
1) High Levels of Trait Conscientiousness: dutifulness, orderliness, industriousness (work ethic + productivity), and self-discipline.
2) Low Levels of Trait Neuroticism (or High Emotional Stability): Self-esteem, self-efficacy, life satisfaction, job satisfaction, little to no depression/anxiety, little to no defensive aggression, low irritability, high social status, little to no sensitivity to stress.
Combined, IQ + conscientiousness + emotional stability have a predictive value of r > 0.6
Low conscientiousness (and agreeableness) is associated with criminality, psychopathy, antisocial behaviour, and aggression. These are actually issues that disproportionally effect the Somali Community in Toronto and I'm sure the diaspora as a whole. Search up "Toronto Murder Suspect" and about 1/5 of the mugshots are Somalis. That's a city of 6million people with 50-100k Somalis.