I practice the following methods to reduce cheating in the class: 1. Before exam day, I spent some time to have discussion with my class, give them a chance to ask questions about exam, also highlight high yield topics for exam. 2. On exam day, I give my class three different versions of question so they can not copy from each other. 3. Maintain an adequate distance b/w students during exams to minimize the chances of copying answers from their sides. 4. If I find someone really involved in cheating in my class then I don't keep quiet, right way I take my exam back from that student, and then make an general announcement that If I will see anybody involved in cheating I will give them zero, no excuse!, but usually if someone doing cheating first time I give them one chance to correct himself.