It's not Cheating if they have the old tests. That's like saying you cheated if you did problems from the book and then the teacher happened to include them on the test. What they're doing is very smart way of preparing. At my university you can go and get printout of old tests. The only thing worse than you turning them in, is thinking that what they're doing is wrong. It sickens me that people consider an advantage cheating. I guess all people with higher IQ's and better study habits are cheaters too.