Passed my exam this morning, above target in all knowledge areas. What a rush!
Most helpful for me was taking as many practice exams as I could find. I read the PMBOK cover to cover once, then went back and focused on Integration, Communication and Stakeholder which were the most challenging topics for me. I also found Ricardo Vargas process map extremely helpful for visualizing how each process worked together within the process groups. I was getting stuck with the linear, here are all the processes for Cost and not seeing how they were fitting together as a system.
Best of luck! You can do it if you invest the time and effort in yourself.