We hear "pencils down", and so the break period comes around. I comply, and the teacher collects our tests. I then picked up my pencil again and started doing a bunch of math, trying to find out how many questions there were per section, or how many multiple choice there were in total, basic things like that.
I got in more trouble than I could have ever imagined. The teacher nearly screamed at me for doing math, and threatened to take me to the principle to have me removed from the exam permanently. She feared I was cheating, and forbade me from doing any more math that day outside the strict testing times.