Michael,
It has taken us a while to develop this, but we now offer a free brain dump sample for all preparing for the PMI-ACP Exam:
www.agileprepcast.com/braindump
Once the exam has officially started you should take two to three minutes and write out your 'brain dump'. You are not allowed to write anything down before clicking the start button.
Writing down your brain dump after the exam countdown has begun will of course "eat up" exam time that you could spend answering questions. So if you are concerned about not having enough time to answer all questions, then spending time to write down your brain dump may not be for you. However, spending a moment of your actual exam time in the act of getting everything you memorized onto paper will additionally give you confidence in your exam knowledge, and you now have a physical reference to go back to during the heat of the exam.