what did you fail on? the interview or the aptitude tests?
I failed at my final interview (didn't do any preparation towards it), was given another chance (still didn't do any preparation - apart from ironing a shirt) and went through. Sometimes it's luck, circumstances, timing and a bit of "x-factor"
2 YES's and you're off to boot camp!
The recruitment process is sketchy and unpredictable, and in that respect it does a good job at preparing for the training process
Bitter? Never.