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Don’t really leave it for reading on the very last moment. I would say read it in between topics that overwhelm you and at the end do a review. Do not skip it and I totally recommend you to read the CFA Ethics and not from 3rd party providers.
I took the exam in June and I read it on very last moment before review… my outcome: I should have read it one more time as the devil stays in details 🙂
Ethics reading is common sense ( do exercises.. a lot… till you get the essence of it), definetely some details specific to CFA,, but is not a tough reading as quant or economics.