I had only read over the ATC information a few times and so when it came to the test knew very little of what was required
P-P-Powerbook;
This undoubtably was your biggest downfall - You need to memorise the booklet and know it inside out. Full stop.
If you don't put the effort in at this stage, then you certainly will not get far if you ever make it to the college! (MATS pt 1 - joy!)
If you feel that you did well in the other tests, then good on you - most people find those the scariest and hardest to pass!
Reference pass marks - I believe that you have to get a certain pass mark in ALL the tests to be considered for the next stage.
Put this all down to experience - take what you have learnt and use it for your application next year. Use this next 11 months wisely too - get as much exposure of Aviation and Air Traffic that you can - it will all count favourably in the interview process, especially that "So, what have you done in the last 12 months since your last application" question in the stage 3 interview.....because all the best pass second time!
