The first topic in the Year 13 portion of the course and the folks at AQA want you to know it. The processes involved in photosynthesis and respiration are complicated and jam-packed with new terms. The good news is that if you get to grips with one then the concepts transfer over to the other. From there you need to think about how energy and nutrients are transferred between organisms and the environment. Again, there are some new terms and processes to learn.
Use the worksheets alongside your textbook and revision guide. The presentations are more for teacher use but students may also find something useful in them.