The Midterm 2 Study Guide is here. This one has more essay/diagram questions than the last one. I recommend that you start by preparing good answers to #1 and #3: diagram & describe respiration and photosynthesis. Those questions will help you build a solid foundation for the rest of the test material. There's a lot to understand for this test, but it's all in two chapters. If you have a solid understanding of redox, electron transport chains, proton gradients, and ATP synthase, the rest should fall into place.