One suggestion is to treat each of those chapters as a book in itself. Specifically the following procedure is recommended.
Photoread the whole book.
Do one 30 minute activation pass of the whole book (get the structure notice where your curiosity gets aroused and also notice what doesn't make sense)
Take f 5 minute break walk away from the study area do something different for those 5 minutes
Now I suggest you spend 30 minutes with the chapter that seemed most challenging for you. 30 minutes and no more. Mind map or make brief notes. You may not feel like you're getting it but that's okay. This is only the inital 30 minutes
Take a break again this time for 15 minutes
In the next 30 minutes I suggest you go over a easer chapter or two if it is possible just to refresh your memory and notice anything that you might be overlooking.
You've now spent 1.5 hours spend another 30 minutes on another chapter or 2 if you wish or take a longer break.
Notice I didn't send you back to the difficult chapter. Let your mind process it for a while. Do the same for any other difficult chapters. Give them an inital study but then move on to different areas. Return to those difficult chapters after having worked on some easier ones (Say an hour or so later.) Often when you come back to it later you find it making more sense and you remember it better.
Leave yourself a 2 hour study session where you give the book a rapid read. Naturally how long you spend on each chapter will depend on how well you already know the information in the chapter and how much is in the chapter. Sometimes 10 minutes will be ample.
Mind map (even badly) will help you to recall and pull information together. Before you end you study session quickly review your mind maps to make sure that they make sense. When you start your next study session remember to review the mind maps (10 minutes should do it) Check anything that you may have forgotten or are not clear on in the relevant chapters.
You can work through the book chapter by chapter in order. Or if some chapters already make sense to you skip around... You have the last 2 hours to do the once through the whole book using rapid reading. (Parts of that will be super reading and dipping anyway because you've already covered it).
That's a general method you could apply. Adapt it, use it for ideas afterall at this point your general knowledge of the subject is better than mine 
Alex
