Step 5: Now that you have definitions in place, you should see the important concepts starting to fill themselves in. This may give you more ideas on what to study, so write them down and add them to your list if you need to.
Step 6: Make a list of any important cycles or processes. Physical sciences are full of them. These are usually easy to learn, because they can be ordered into steps, but sometimes involve understanding of chemical reactions that can be tricky (like the hydrologic cycle).
Step 7: Go back to your lecture notes or textbook and read over the material that was covered for your class. Do not read every detail, but skim each page for thirty seconds a minute. Now that you have quizzed yourself on terms and processes, the concepts should jump out at you. Think of it like reading a novel. When you know all of the characters and have an idea how they behave and what they look like, then it is easy to get immersed in the book and just follow the plot. People do not have this experience when reading science textbooks because they don't know the "characters". That is why it is important to learn the definitions and processes before doing this step.
Step 8: Prepare! I said you have plenty of time, but that doesn't mean you have unlimited time. Start today! Start right now! If you put in a few hours of work every day, then by your exam you will know and understand more than you imagined you would, but if you don't put the work in, you're screwed.