One of the best ways to cheat on a test, pretty much any kind of test, is to read a lot about the material that is going to be on the test beforehand. I would read about it a lot, especially from notes that I may have taken in class. It got to the point where I would memorize the course material before the test.
When it was time to actually take the test, I would use my brain to remember what I had read earlier in order to answer the questions in front of me. This method is actually really sneaky because a teacher can't see you doing it, you can sit there and they would just think you're looking at the paper, when in reality, you are drawing upon the knowledge you learned in the past in order to put down the right answer.
I literally never got caught doing it either, it made college so easy for me. I'd always kind of smirk to myself as I turned the test in with the professors none the wiser. "Job well done" I'd think to myself, they didn't even suspect a thing.