| I wouldn't say anything. It's against rules but some can't afford to take those tests more than once (that is, unless you get to retake it free of charge) and you could be jeopardizing something important to your peers. I think your teacher is an idiot for doing that though.
In this case, the right thing, at least on a post-conventional level of thinking, would be to not say anything, even though a rule was broken. |