There was someone who did the testing (for the second time) on the day of my testing. On her previous attempt (12 months before) she had passed all the sections except the last one (the separation one) which she had failed by one mark.
Her results for her second attempt were the same - she passed everything except the last one - by one mark again.
Which seems to show that the same person will obtain generally the same mark on each try for the testing.
Which obviously means that I reckon that if you pass the testing first go, you would pass second go as well. Then just charm them in the interview and you're in!