This packet includes a study guide on photosynthesis and cellular respiration, and how they interact to make a life cycle, and a test which is very similar to the study guide, but with the organelles switched! My students found this set to be challenging, but many did very well. I feel that they got the basics by understanding this study guide. I would say that it is sort of a "middle-of -the road" complexity. I lectured, of course, before they did the study guide. You can see my tutorials under "Photosynthesis and Cellular Respiration Tutorials" in my store.