I wouldn't worry about it too much. I went with very little prep time and managed to pass!!!!
Like blobmeister says dont flap over it. When your laid down on the floor looking up from behind the GPMG and you cant remember what comes next, your mouth has gone all dry and every one else in the syndicate is looking at you (knowing what comes next)........... dont worry about it.
Mate I enjoyed my course; even the dry mouthed bits. Take each day as it comes and if you get stuck, dont be afraid to ask your SSI SASC bloke who will be more than willing to help you out.
Most importantly dont stay up later than 11pm, that was my cut off time.