Major IQ differences in twins due to schooling, challenging decades of research(psypost.org)
psypost.org
Major IQ differences in twins due to schooling, challenging decades of research
https://www.psypost.org/major-iq-differences-in-identical-twins-linked-to-schooling-challenging-decades-of-research/
Intelligence is not single dimensional though and simultaneously convergent forms of intelligence testing are heavily prone to bias.