We Recommed the following method to read PMBOK 

• Glance through PMBOK first to just get a feel or high level view once.
• In next reading understanding all the processes, interactions, and all the terms and concepts. Make notes that suit you.
• Refer the notes and keep revising it till you feel comfortable.
• You dont have to memorize PMBOK.  Try to relate the terms ,
  theories and concepts with your experience or with examples. The terms
  in PMBOK are inter-related to each other and everything can be mapped
  to real-life examples.

• Check for materials on this site or elsewhere to step further into the topics you have doubts.
• Take tests chapter wise for each chapter. then move to next chapter.
• Take overall simulated test to know how close you are

ƒ     Make notes, Summaries & highlight with colors.

ƒ     Try to visualize & draw mental picture.

ƒ     Use memory association tricks

ƒ     Take the tutorial on  computer test (even if you don't need it). You don’t want silly mistakes in exam.

ƒ     Understand Navigation, marking items and go back to specific items

ƒ    
use the rest of the time allowed (there is a clock in the upper right
corner of the screen) to write down key formulas or other summary
notes, phrases, and pictures you have memorized.

ƒ     Mark any question you are not reasonably sure of, so you can review later

ƒ    
Skip any questions that will take "a while" to figure out  or
understand - you want to answer all the questions you know first, then
go back and spend time on more complex questions

ƒ     Read all questions at least twice before answering

ƒ     look for words like "NOT" or "ALWAYS"

ƒ     Read all answers, even if you see a correct answer

ƒ     there may be a "more" correct answers

ƒ     Be calm & positive, Say to yourself, I will pass this test.