Hello,
My suggestion for you is to start by reading the books (both RM's and PMBOK) and do related exercises after each chapter. Then you go for the simulator exam, which will help you to get familiar with the context of the real exam, where you need to manage your time efficiently.
After each simulator exam, take time to go through all the answers, mostly those you did wrong and those you marked, regardless of your answers being right or wrong.
Reading the explanations provided for each answer will bring you back to different parts of the books for a better understanding.
Try to manage your time to be able to go through all the seven simulator exams and get good scores.
The key to success is to do as many mock questions as possible, and if you can additionally work with RM's exams, it is undoubtedly a good thing.
I hope this will help you, and I wish you good luck!