Checking in - we got graded on it. We got three grades for each class: a letter grade and then work habits and something I forget. The other two grades were graded E/S/U - excellent, satisfactory, unsatisfactory. Those grades would go down if you didn’t shower.
If you were on your period, you were allowed to “towel shower”. That is, you could keep your shorts on, wet the end of your towel, and use it to hit your pits and any obvious dirt. You’d only have to say you were on your period if everyone was calling out their names and the teacher wasn’t looking up from the tally sheet. Later in the year, she’d know everyone’s names and could do a visual check off.