The Ability to Learn!
It is not fixed. This video is only six minutes long. It gets interesting at the 2-minute mark, good at 3 minutes, and hits home at 4:50.
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Yes, over the years, decades, centuries and millennia, EVERYTHING has been confounded, especially, the scientific method.
So is the ability to take tests under pressure.
The guy who was 'favored' by most to get the highest SAT score
in our class failed to perform when needed. He performed well
every day in classes, but not when it was crucial.
He became a successful eye surgeon and performed that task under pressure
very well for 40 years.
In my experience, the people who excel in math have the highest IQ's.
They might also be the most motivated, but it's only one factor.