There are many test-bank computer programs available that will automatically do this for you. If you change the order of the questions, make sure that all versions are equally logically ordered. For example, if one version was in a logical order and the others were in a random order, those students with the added cues of order may do better on the exam. Make sure the versions alternate when they are handed out. Have students keep the exams face down until you signal the start.
Some instructors choose to identify the versions on different colors of paper.
This means that the proctor can identify if students have shuffled the order of the exams and are sitting next to others with the same version. However, this also means that students may be able to identify a potential source for cheating. You may also choose to use 'phantom' versions where you indicate that you have more versions than you actually have. Other tips Be sure all desks are clear and materials placed out of sight before starting the exam. Have students turn any caps backwards in case there are notes written under the brim.