Rote memorization of patterns. When I took the test the answer was usually the middle choice.
Cross out the wrong answers so that you only have the question and the correct answer. This way if you don't remember the question but recognize the answer, you have a good chance at getting it right.
Remember- 99% of the junk they ask you on that test isn't really applicable in real world ops anyway. If they wanted it to be a real test of knowledge, they wouldn't a) publish the answers, b) use NOS charts (the last time I even owned one was years ago when I was flight instructing), c) use way outdated methods of determining weight and balance and performance (I know that I don't use a table to calculate w/b for my job... we have a whiz wheel or spreadsheet, and a computerized program for performance numbers).
Just play the game, get through the written any way you can, and move on with your life.