Melbourne Private Schools - how to get in????

We had our son down from birth for a Melbourne private school and we were told due to family connection wed be preferred. Attended the interview and very positive vibes but since have missed round one and two offers. Now scrambling as to getting him into a private school (hes grade 5 for year 7) any tips or tricks?????? Hes really sporty but not terribly academic but generally a nice kid.
The opinions expressed here are those of the individual and not those of
people following this discussion