2 things.

1. Where does it say the author is a male? I didn't see that, and the name "Kris" is used as a female name just as often as a male name[1]

2. I'm not sure the parent is saying that this is the best way to test math, rather that it is better for math than any of the other subjects. i.e. 2+2 is always 4 but writing essays is a whole different ballgame.

[1] http://www.nameplayground.com/Kris

EDIT: I think standardized testing sucks mostly, just wanted to offer an alternative interpretation on the math testing part.