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If you’ve read it once, I would not go through it again in detail. My advice would be to do a bunch of questions and cheat and look at the answers where necessary. You’ll quickly get a feel for what the key points are in the chapter, and then be able to refer back to the text in a more targeted manner.
Top tip for next time around (if there is one): Prepare a one page summary of each chapter as you go. Then that’s all you’ll ever need to re-read.