I'm not sure if this correlates, but my parents never read to me when I was young, and I ended up being horrible in Literature classes. But they did, and I kid you not, create math problems for me during summer breaks.
My dad always told me, "It's a shame that an Egyptian would get a 99 on a math test. That is failure in our eyes!"
And if there's extra credit, then any point below the max score would be failure.