@Qlad this is just my 2 cents, but I hope it helps you somehow.
I think you should go back and read your notes once again, focus on the topics that you always find yourself unsure of the answers. Then, go back and answer the questions again, this time without looking at your notes since you won't have them for the actual exam. I usually try to keep my notes away from me when I am taking the tests. I also like to take notes (on a notecard or legal pad, sticky notes…anything around me during the tests) and write down the particular answers to the questions that I always get wrong and think about why it should be the answer, so that when next I read my notes, it's there.
REG is more about the application of the rules, so you should think about the rules that could apply to a particular question, before you answer it.
Good luck…I hope this helps you some how. My exam is this coming week, so I kinda understand the panic you are feeling.
FAR - Passed
BEC - Passed
REG - Passed
AUD - Passed... DONE!!!
Ethics - Passed (December 2013)