Jensen-Kirkegaard 2024 is S-tier best due to error-averaging across datasets and superior coverage. Rindermann 2018 is A-tier for correcting sampling biases and using regional scholastic data in Africa and Latin America. Harmonized learning outcomes is A-tier with good methodology, coverage, and accurate large countries like China and India. Lynn 2002 is B-tier solid for its era despite unnecessary geographic imputations. Becker new version is B-tier believable in rank order and differences. Basic Skills Dataset is B-tier superior methodology but less coverage. Henss is B-tier composite but errs by including geographic imputations flattening low-end averages. Lynn 2012 improves coverage to 133 studies but lags without later scholastic data. World Bank test scores is C-tier flawed by odd winsorization exaggerating low-end gaps and deflating high-end. Becker old version is C-tier implausible lows like Nepal's 43 and uses imputations. Human Capital Index is D-tier unstandardized and contaminated by health-education proxies. Sub-Saharan Africa averages lowest across top datasets. Rindermann underestimates most East Asian IQs except China. Harmonized outcomes shows Bangladesh below 70 and Western/Central Africa too low. Morocco surprises as low for stable African nation. Ethiopia below Kenya and Sudan despite imperial history. Africa shows west-east IQ axis possibly from Bantu expansion or colonization differences. Pakistan bafflingly low versus Afghanistan and Saudi Arabia despite cousin marriage. Somalia could rise most with stabilization.