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There are many benefits to timing your practice, including:
A book I read recommends drawing a grid during the un-timed sections at the beginning of the exam (when they ask for school information...etc).
You can then write 'X' in the grid during POE process.
Personally, I did not find doing POE on the board effective, especially during the exam when time is tight. To me, crossing out wrong answers in my head works better. Your mileage may vary though. The best is to find out by doing computer practice tests and see what work for you.