I did the same thing! Except I learned the material early and offered to teach fellow students for a math exam. On the math exam, all of the students got the s

I did the same thing! Except I learned the material early and offered to teach fellow students for a math exam. On the math exam, all of the students got the same question wrong in the same way. It seems I taught the material incorrectly. I got called in front of the dean and educated about cheating. In the end, they suggested I don't do this anymore, but did not consider it to be cheating.