AUD is a very different and difficult beast. It's the only test that I failed and failed twice also. Jeff himself says the test is very different from the others due to its subjectiveness.
You really have to hammer the concept. Don't do multiple choice questions just to do it. Audit is also the easiest in terms of going through the MC questions because it feels like you can do 20 mc in 5minutes but you have to understand it conceptually.
Make sure to nail down all the different type of engagements, make sure you understand internal controls and why they are key controls that allows for separation of duties. Why these controls help protect and entity from fraud, misappropriation etc, and learn those assertions and how each test satisfies management's assertions!!! You got this man, I believe in you!
