Hello new.at.this.
I had almost same experience like you before. The main reason why I have failed to use PR for exams last year was lack of purpose. Question yourself, "what do I want to get out from this book? What section should I focus to do well on the test, etc." Having strong purpose in the preview step as well as having relaxation in prepare step will found the strong base of reading.
You said you have finals soon.
So this is what I would do if I were you. First prepare by imagining tangerine at the back part of your head by closing your eyes and have a purposeful statement what you want to do with the book to do well on the exam. Then enter the preview step and see the table of content that matches up with the chapters that final exam will be on.
Photoread twice each book. Then Listen to Memory supercharger for 18 minutes and enter the activation step.
Here, I am sure you have a practice final exams if you are a college student. So do the final exam and check the answers. Superread&Dip by reading the questions and choices that you missed from the practice final exam.
Then I recommend you to do rapid reading and do the mind map.
I have done this way for my history exam and I got 96% hitting the curve. My friends can't believe my result because I used to get around 75% on every exams spending more than 12 hours total before the test. If I can do this, I am sure you can do this too. 
Anyway, I hope this is helpful for your final exam. Good luck on your finals 
-007-