I completed the assessment last August,was a little concerned about the Physics and maths due to the fact its a while since i passed my o level physics( yes o level!). It was pretty straight forward but to give myself the best chance i used the Oxford cd's for both subjects which can then be used for ATPL prep.
The questions where no problem, not up to o level, so if you can't get the cd's in time, get the gcse revision books and go for it!
Don't aim to pass, aim to answer all of them, if you have spare time, keep going at any unanswered questions. Make sure you go through everything before you put in your answer.(Not trying to teach anyone to suck eggs,just encourage)
Good luck to you all.
Nick.