When you cheat on an exam you are cheating yourself. The reason to not cheat is for your own sake. Work hard, study, do your best. If you cheat and get caught you may get 0 on the exam. If you cheat and don't get caught it will make you believe that cheating is easy and the way to go, but eventually you will get caught and the further along in your education you are when you get caught, the worse the consequences will be. Show how smart you really are, and don't cheat.