As a professor, I change my tests all the time for various reasons. Professors did so when I was a student as well. However, the test files are invaluable because you can see what kind of tests the professors give. When I took calculus, I had this impossible-to-understand Iraqi instructor. Thank the Lord that he had a few tests in our file so I could follow his style; otherwise, I'd still be sitting at Auburn trying to pass cal.
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