Oh my god all the time in grade 12.
I have this one friend who was in both my Physics class one semester and my Discrete Geometry class the second semester. In Physics, we'd get these INSANE tests and quizzes almost everyday. So we'd look off each other's work to make sure we were both doing it right. And sometimes we'd split up the multiple choice questions among us so we'd finish on time. Everyone in the class, save a few people with no friends, cheated. :|
Then discrete... oh my gosh that class was so funny. We cheated on everything. One day we had a substitute teacher instead of our bumbling normal one. She caught my friend looking off my paper at one point and chided him for it. She apparently wrote our normal teacher a note about it. So the next day when he came back, he came over to us to talk about it. He thought we were going out (COULD NOT BE FURTHER FROM THE TRUTH) so he said, "I know you like her, but you need to keep your eyes off Erica during tests" and... and... it was so, SO hard to keep a straight face after that. He didn't believe he was cheating at all (I think we ended up doing completely different things to get answers on some questions). Ahaha, we never did get caught, not that it made much of a difference since when he caught one guy cheating during one test, he just had all of us work in partners for the test. That teacher was so weird. XD;
I used to be above cheating and stuff but... I stopped caring by the end of high school. Oh morals, what happened do you? :C