I have not taken the exam yet but from what I understand from friends that have taken the exam here's how it works. You are given a marker and 2 white boards right before you enter the testing room. You are allowed to write on the boards (mnemonics, etc) during the tutorial time before you start your exam. (One of my friends actually practiced what she would write on her white board for a few days before the test and as soon as she sat down at her testing computer she did a memory dump onto the white board and skipped her tutorial). As long as you don't take an excessively long time jotting down some notes before your exam begins, you won't raise any flags.
The white boards stay at your desk throughout the entire exam, they are not taken away during breaks. You are allowed to add to the white board throughout your exam and you do have the opportunity to go into your locker and glance at your FA or notes during breaks.
Hope this helps!