cunninglinguist,
Alot of people, myself included, did'nt come close to finishing the tests ( I reckon I averaged around 70-75% )
I got through, my guess is accuracy is more important than speed ( to a point ) if you got through everything, good on ya.
Well my guess is that you don't really need to score all that well to get through! After all, Jetstar has been known to offer interviews to those that failed the QF testing, even to people who never applied to them!