Bridge,
I'd try not to get too wrapped round the axle by scores/numbers (yes, I know, I was the same). There is a lot more to it than that - and besides, you can't change anything now, it's done (for now)!
There is a lot of stuff spouted about the aptitudes, many people have titbits of info and it's easy to bite off on the 'little snippets' and assume they are of huge importance. Loads of people have much to say about it - which is good in some ways, but there is a LOT of misinformation/misunderstanding about.
I wish you the best of luck - and if you don't get it first time, just keep going and going and they might just get sick of you and let you in... (I managed to fail several times!).
Ray :-)