Almost certainly wrong for most people. Unfortunately, contra liberal comfort beliefs “hard work” is not enough for many people — though it’s not all genetics, of course. Development environment, brain injuries (including from lead), and other factors mean that not everyone is endowed with enough ability to perform well in math.
There is certainly nothing more I could’ve done to be any better at this and there are many people like me out there. The “hard work” myth is a pervasive one, though. But there is only so much time in the day, and only so much ability people have. That’s a hard truth, but the way it is.