Hey mate! Sorry to hear 'bout your failure.
You say that you're confident that u would pass the final board. In that case, at the age of 22, I would spend the year waiting.
Keep your skills up to date and just do something else for the time being. I don't know alot about how these things work but that's what I would do. One year... How much is that if u hold it up against the rest of your life and a potential career? And if u fail again? perhaps u could spend the time working out a second plan if this one fails... Keep your chin up and put it all behind you.
Good luck!