National IQ correlates 0.74 with GMAT scores. National achievement correlates 0.74 with GMAT scores. English proficiency correlates with national IQ and GMAT but does not explain variance. English usage rates show zero correlation with GMAT or national IQ. Caribbean nations average GMAT 444, matching sub-Saharan African scores of 440. US blacks score 431 on GMAT, whites score 539. Europeans score around 550 on GMAT. GMAT validates Lynn and Vanhanen's estimated national IQs for untested nations. National IQ explains global GMAT variance ignored by test makers' language excuses. GMAT predicts business success across citizenship groups without bias. National IQ predicts individual outcomes like GMAT does. Path analysis confirms national IQ drives GMAT and English proficiency. Results robust across sample sizes from n>0 to n>199 test-takers. GMAT provides IQ estimates for Caribbean, North Korea, Rwanda, St. Kitts.