Hi John,
If you're using the 80% guideline for your exam preparedness, you really aren't too far off! And if you're doing brain dumps and flashcards, you're probably already good-to-go on the process chart, vocabulary, and formulas (just make sure you're completely comfortable with using the formulas so that the math questions become easy wins).
What I'd focus on in this final stretch is truly knowing the processes. Sure, you may be able to draw up the process chart in your brain dump, but can you speak to the inter-relatedness of the processes, i.e. the hand-offs from one process to another? I'm not recommending memorizing all the ITTOs, but definitely understand the MAJOR inputs, outputs, tools and techniques, and how these components relate to other processes. It's all about patterns: As an example, examine how work performance data/information/reports and change requests float around as inputs and outputs of many processes, and challenge yourself to find other patterns. Also, you'll find that if you practice explaining these processes out loud, you'll tend to notice more knowledge gaps. Write these knowledge gaps down and then research in your Rita book.
Hope this helps, and let me know if you have any other questions!
Cheers,
Chris
