A large GWAS has found 74 regions related to educational attainment which collectively explain 0.43% of the variation across individuals. The study was composed of over 400,000 subjects. As noted in the article educational attainment is strongly related to social and environmental factors, though genetics do play some role estimated at 20%.
1271 SNPs for Educational Attainment were discovered in a GWAS of 1.1 million people. Those in the highest versus lowest quintile had a five fold higher rate of college completion. Optimized PGS would yield 17 SD of EA.