You believe that a student is cheating during a very important exam. You also suspect that other students are attempting to cheat when you are not looking directly at them. How should you handle this in an appropriate way?
This is smart, I would also do this.
I like the lettering or numbering of the test, great idea.
This would be a good place to start. It is important to see if their are any underlying causes for bad behavior of any kind.
I think that's to harsh, the teacher only suspects cheating.