Working on my Google AdWords

Got a big certification test next week at work. Have to know Google AdWords backwards and forwards. It's a test with 120 questions in 120 minutes and you have to have 85 percent to pass. AdWords is very complicated, I can see why they pay people big bucks just to handle their account. Doing Adwords properly is a big job. I would bet most don't have their account optimized for a maximum return on investment. My test is May 5th so please start praying now.