IIRC, the front of the exam gives you somewhat of a table of contents at the beginning (i.e. Ethics: #s 1-18; QM: #19-32, etc…). I don’t recall if they also divide each section (i.e. after question #18, a sub-heading saying the next 14 questions are QM).
I believe it makes sense to do the exam in the order of which areas you feel you have the best grasp first. That way, you make sure you’re not rushed when answering your strong suits. If you do, make sure you check periodically to make sure you’re answering each question in the proper scantron spot.