These sort of arguments always ring hollow for me, because I am not a WASP and the test I took didn't resemble a WASP-culture test in the slightest. The test I took was all "given this series of abstract geometric patterns, which comes next," not, "During which season is the weather at Martha's Vineyard the most temperate"
Maybe wrapping your mind around abstract geometry is something WASPs are good at and, say, people from the Islamic world suck at, but I really really doubt that considering the relatively elevated roll geometric patterns have in Islamic culture compared to WASP culture.
Of course I am neither a Muslim nor a WASP, but even so I am pretty sure I didn't struggle too hard on that test.
That example probably popped into my head first, because of the long controversy around IQ tests cultural effects and the history of using those tests to make arguments that race determines intelligence
Even if you feel that Psychologists have failed to do so, you still have to explain why East Asians and Ashkenazi Jews consistently outperform WASPs.
there is also no evidence of strong cultural bias of the sort you are speculating about.