Isn't it possible that the biggest parts of their brain may not actually be the areas that specialize in math or nation building?

For example, I have seen studies that say Eskimos are very good at remembering things. Their visual memory is on record, better than Whites.

https://journalhosting.ucalgary.ca/index.php/arctic/article/download/66174/50087/187190

ABSTRACT. The hypothesis that the ecological and cultural characteristics of Eskimo society lead to village Eskimo children having greater ability in visual memory than urban Caucasian children has been studied. A test of visual memory was given to 501 urban Caucasian and 125 village Eskimo children. Village Eskimo children demonstrated significantly higher levels of visual memory. Visual memory was also found to increase significantly with age. A follow-up questionnaire study indicated that about 65 per cent of teachers in Eskimo villages noted the unusually high ability of Eskimo students in recalling visual detail or mentioned their high performance in tasks depending partly upon this ability.

But their academic performance has been recorded, and they still have the highest dropout rates of any race.

https://jan.ucc.nau.edu/~jar/AIE/Dropouts.html

American Indian and Alaska Native students have a dropout rate twice the national average; the highest dropout rate of any United States ethnic or racial group. About three out of every ten Native students drop out of school before graduating from high school both on reservations and in cities. Academically capable Native students often drop out of school because their needs are not being met while others are pushed out because they protest in a variety of ways how they are treated in school.

Or see this study

https://files.eric.ed.gov/fulltext/ED025225.pdf

Of the original number of Alaskan natives entering the University of Alaska from rural and urban areas, 507 drop out at the end of their freshman year, and less than 27 are likely to receive a degree at the end of 4 .years. This high attrition rate is caused by poor elementary and secondary school preparation, and strong personal feelings of inadequacy that are intensified at a campus that is both integrated and oriented toward Western culture.

And obviously Japanese or Chinese immigrants aren't failing school, so I would doubt why would Inuits somehow be better than them?

In the CBC link I also posted, the average Inuit salary is considered less than $20,000 a year. Compare that to Canada's national, which is $54,630 a year.