[hc-taway]

My graduating class was remarked on through multiple schools as an exceptionally smart class. We had lots of very bright boys and girls. Maybe our class was unusual in other ways so this isn't part of a broader trend or tendency, but practically all the smart girls did all their homework and maintained a 3.5GPA or higher (most more like 3.8+), while probably half or more of the smart boys skipped lots of it and pulled Cs and Bs (with the occasional A in classes that had little homework). Meanwhile, those same boys who skipped much of their homework scored in the top percentile or two when it came time for ACTs and SATs and achieved excellent marks on annual state testing (not that the latter matters whatsoever for students), were often in gifted programs or active on "smart kid" extracurriculars, et c.

So those boys "did poorly in school" (which, to be sure, wasn't a great thing for e.g. college admissions above high-tier state schools) but that didn't give the full picture.