Performance on the day can play a big part in whether you land the job. That includes the psychometric and interview. I knew a bloke a long time ago who was interviewed by Ansett and by his own admission did not put in a good performance in the interview. He is now a Captain in QF with a decent seniority number.
People should have another read of this quote from Keg:
A knock back from Qantas doesn’t define a person- just as getting a job with Qantas doesn’t define a person.