The test is designed with different ability levels in mind. For lower groups, use questions 1-14. For more capable groups, there are short-answer/essay questions(#15-20)that require a more thorough understanding of concepts. There are also bonus questions included. Although they are useful on their own, they were actually designed to go with my other Moon products that are listed with my other offerings. They include an informative, stand-alone All About the Moon PowerPoint, hands-on activities, and a review game. IF YOU PURCHASE THIS PRODUCT PLEASE PROVIDE A RATING AND FEEDBACK. I REALLY WANT TO HEAR WHAT YOU THINK.