Hey
one of the worst questions in the personnel one was "are you a quick thinker?" "yes". give me an example of you thinking quickly" "think i am doing a pretty good job of it now!" was my answer although not sure if they had a sense of humour. I worked my arse off for the technical interview and as long as you prepare and dont panic it should be fine. My interviewer wasnt the kindest in the sense that he finished off with the kind words of "dont worry, lots of people re-apply for a second time"!!! Great i thought but actually did fine. So dont take too much notice until you hear afterwards...
with the computer tests, make the most of your time to practice. Cannot really prepare for them in advance but would advise you to brush up your basic maths skills.
good luck and keep me posted.