Is there anything comparable to the CQE Study Guide for the CMQ/OE exam?
I also saw a session available at a conference.
I took my exam before the essays were removed. I was part of a study group ran out of my local chapter for people taking the CMQ/OE exam at that time, we focused on the essays.
I had the CMQ/OE primer from Quality Council of Indiana and the CMQ handbook from ASQ as reference for the exam and studied them over 4 months before the test.
The biggest advice I'd suggest is to get the practice exam from the Quality Council of Indiana and the Practice question bank from ASQ. Save a half hour a day on your calendar to go through these questions and learn how to take the exam and understand how questions are constructed. I think the practice exams are what helped me be able to pass the exam on the first try.
Good luck. It takes some time and effort, but it's doable.