Presuming that the testing process allows for this, I would suggest going quickly through the test and answering the ones you know you will get right. Next go after the ones that you think you have right, but want to look in the book to confirm your answer. Don?t go after the ones that you don?t know, and that you need to look up, until you get through the others.
This plan will give you some number of correct answers to start with, and will give you confidence that you can get through the rest. If you wind up running out of time, it is better to have a major portion of the test completed at that point. But if you spend time early on looking up answers, you may have fewer correct answers turned in when the clock runs out.