Throwaway because this is one of the data points you are required to ignore in polite society.
Girls receive better grades until you blind the teachers. Teachers are biased in favor of girls, maybe because their behavior is better. The effect of biased grading is enormous and a huge disadvantage to our boys.
> Gender-biased grading accounts for 21 percent of boys falling behind girls in math during middle school. [1]
In blinded effects, boys overperform in math and underperform in literacy. In non-blinded effects, boys underperform everywhere.