How to revise for an open-book examination?

This might be a silly question but how do you revise for an open book exam?.
I have one in 7 weeks based on 10 weeks worth of lectures and I'm unsure how to go about it because we can take in lecture notes,any other notes,books,journals etc.
Obviously you require different strategies to closed books exams e.g. rewriting notes won't be useful when revising for an open book exam.
I was thinking of writing out all my lecture notes but that's a waste of time right?.


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