The final is cumulative. That means everything is fair game. But the focus will be on the newer material. Use the course discussions and questions from the quizzes as a guide to reviewing the earlier material (and, of course, the specific readings for the earlier quizzes).
Here are the readings from the last chunk of the class. This is just the material not covered on our previous quizzes.
Chapter 19: Skip 19.5, 19.6
Chapter 20: Read pages 637-645, and Section 20.9
Chapter 22: Skip 22.3 and 22.4
Chapter 25: Skip 25.5.2, 25.11, 25.12