Read questions carefully. I took the exam today. There was a really messy network diagram, and i immediately tied copying it down on my scrap paper and going through the process of getting, ES, LS, critical path, etc. Then I read the question. I obviously can't tell you what the quesiton is, but let me say that there was really no need for me to use the scrap paper. The question was quite simple if you understood basic critical path.