Well, it sounds like the plot may have been simpler - just Nalia switching tests. If it ends up being the case, I've got some apologizing to do, but some punishing at the same time.
Today was just a crappy day. I had three tests to give and I caught so many cheaters, I hesitate to count. For my worst turma, I gave slightly easier ACS and they responded by doing much better on the test than they did for the first ACS (quiz or test). Progress.
My brain is pretty fried and full, and I just need to let it unwind.
Peace
John