I don't think there are any practice exams associated with Google Adwords. Are you asking about the QUIZ? If you are getting all your QUIZ questions answered 100% you can sore well during your exams. But the exam questions are not same as those at the quiz, but around it.
The exam questions were pretty similar to the ones in the learning center and the stuff you go over in the GAP classes.
The questions are definitely not the same. Many are similar in that the question is that same, but the wording is different compared to those in the tutorial quizzes. If you have any experience with AdWords, the test won't be too difficult. I'd study up on the international and billing questions...