Anyone can do an internet search for “Average IQ by country” to get the basic information that the NIH is trying to cover up.
Genetics is not everything. A lot of how well students do in school is a function of their culture. I think I’ve seen studies that show that persistant hard study over years can boost intelligence test scores by a standard deviation.
As well, this increase in IQ is heritable.
Genetics is the base stock of what a person has to work with.
You can make a great basketball player out of guy who is 5’8” but a guy who is 6’8” comes with built in advantages if he is trained to the same degree as a guy who is 5’8”
Having said that people can be really smart but just not wise. That’s what today’s universities teach. No wisdom. No wisdom at all.
As well,