I used one of my GCSE revision guides I still had.Didn't help too much since The Q's were varied from what I had revised.I got the same score as you though.
The whole day and selection process was based on your performance on all tests,and although my maths and physics results were average,my scores and the aptitude testing were very good so this led to an overall above average score.
It was enough to be offered a place on the course,and the assesment they give you is good to show to the bank manager in the quest for funds!
I went modular in the end but I think doing the assesment was well worth the trip.
P.S check your p.m's.