Please note that for the open-book exams, you can take any personal notes related to the course.
You can access all the notes that are written inside the course materials from myPECB Dashboard and also the personal notes outside the myPECB Dashboard needs to be hard copy printed since once you join the exam session, you will not be able to switch between any other apps, other than the PECB Exams Application.
There is no limit on what you write or take as long as it is related to the course materials.