LEED v4 AP O+M MOCK EXAM: Questions, Answers, and Explanations: A Must-Have for the LEED AP O+M Exam, Green Building LEED Certification, and Sustainability

In spite of a few errors, I found this book to be very helpful. I have not yet taken my exam, but thought I would post here now, as reviews from other people have given me peace of mind about purchasing other things.