2 Guys at my school cheated in a GCSE exam... they were kicked out the school, and were disqualified from all of there GCSEs. They ended up having to go to a different school to repeat there GCSEs (Well, one did, the other went straight into work and last I heard ended up joining the RAF or something)
Basicly, don't cheat, not worth it, etc, etc.
Oh and for coursework, tutors will know if you cheat, my housemate got done for collusion, along with 5 of his mates (out of 7 of them that did it, so one was smart enough to edit his sufficiently). None of them got kicked out of uni, but they all had to repeat that module the following year. (Funnily enough, this freind of my mine is now in the 5th year of his 3 year degree!)