Hello nickyg
Must say that your situation is almost identical to mine this time last year.
Second shot at OASC was, for me, much less daunting than the first, once I was actually there and settled in doing the tests etc.
All the advice here is great but don't forget your own impressions of how OASC was for you last time you went. It's best to improve any personal weaknesses that OASC highlighted to you. So, as has already been suggested, get yourself a debrief, work on the areas that need it and go back to OASC with confidence. Your squadron have seen some potential in you now you just need to show OASC more of the same!!
Remember your UAS is a great source of good gen on OASC as alot of people have been there quite recently.
Good luck!!
SR
PS - OASC rep. visited my UAS last week and said that fittness test is still a best effort so don't expect to be stopped at 10.6!