The Flynn effect seemed to be working for a while, but global IQ levels have been declining since the 90's. I wonder why...
https://www.weforum.org/agenda/2018/06/iq-scores-have-been-falling-for-decades-new-study-finds/
"This is the opposite of what happened during much of the 20th century when IQ scores rose by around 3% a year.
This is known as the Flynn Effect, named after James Flynn, the scientist who discovered the trend. His research, published in 1981, showed that IQ scores had risen steadily over the 20th century, with an 18-point gap over two generations.
Flynn concluded that this was down to culture – society as a whole had become more intelligent as it got to grips with bigger ideas."