Dont want to sound harsh, but if you are getting a 12 month knock back so close to the age limit, it implies you have some fairly substantial personal development to do, and you may be too old to actually suceed in this.
What did you fail on - at least this way we can give you advice on how to improve for next time?
I failed for being too nervous and skatty in my interview and then my naval knowledge was too basic (I was told to gain more naval knowledge, but this was my own fault for only learning the basics about the RN and assuming that RM, RFA and FAA questions would be negligible )on the PLT exercise I didn't finish but did okay and the planning exercise I messed up a couple of TDS calculation on the quick fire, but the participation in the planning and then the final individual presentation went well.
My bleep test was good and my psychometric tests were slightly above average (although I don't know how much and they didn't give me any details either).
My plan of action at the moment (this might change after my AFCO debrief) is too probably do some volunteer work to try and get some more example of leadership, outside of a bar/restaurant environment, learn more than just the basic facts about the RN, RFA, RM and FAA and hopefully get a couple of visits to shore bases and ships under my belt. All in all, be a lot more prepared for the AIB and not to underestimate its difficulty again.