The first time I did it was in second grade, the teacher caught me and I never did it again ; _ ;
The last time was just the other day, actually! The teacher was outside but within visual range so I just kinda leaned back little by little until I was able to exchange a few words wityh the girl behind me - but no luck. I didn't understand anything ; 7 ; (That was the same girl that helped me cheat on a History final akljfa bless her ehart I hate that class)
I missed writing an exam in math in a topic I really didn't understood. So the class got their results back before I had to do the exam myself, and I asked someone to lend the result to me so I could prepare better. The day came, and my teacher sat me in a small backroom together with a student of the 13th grade (highest grade before university), and teached his class in the neighbour room. He didn't checked on us, we had no overlook, nothing. I looked at the exam - and got exactly the same like the rest of my class, even though they got their results back. The other student started to phone-call his classmates and let them help him, and I didn't saw any reason why I shouldn't get the corrected result of my classmate and just copy the real results, putting in some errors of course so it wouldn't look too much like I cheated.