Hi Muhammad,
While I used Rita's book, I did NOT use or memorize her process chart. I DID memorize the PMBOK's process chart. I found this helpful in answering questions about steps/next steps on the exam.
I think this falls into the category of "what works for you." If you see that Rita's chart helps you in answering questions, great! Just because someone suggests an approach or has success with a particular approach, you need to vet it's usefulness to you in light of your PM experience, your learning style, etc.....
Best of luck!
Tracy