casa notes ok
I sat the ATPL HUF exam a few weeks ago and had no problems. Get the 'safety behaviours-human factors for pilots' notes sent to you from casa. It costs 15 bucks for postage. READ the notes and a Tait text for the other stuff on illusions etc and you will have no problem. If you can't pass with that - address your study techniques. Happy reading.
(P.S - another good read is chapter 11 out of the latest ATC HUF text)