To answer the question yes you can fail, and contrary to some previous posts, some have more difficulty with the final exam than others, just as some have more difficulty with the water work. Also the instructor can help you to understand material but should not "coach" you through the wrong answers as some instructors do. If you answer 13 questions incorrectly, regardless of which ones, a re-test is in order, after some additional time to re-read and study.-M