My daughter is turning 18yrs in a few months but is currently only in yr 11 and still has over a year to go at Secondary school .In the past it has been a struggle to come to an agreed fair amount that should be paid based on his income. She was 16 when child support was first initiated. My ex is paying child support through gov agency ( child support agency) but only for the past 9 months as previous to this date is was via private agreement an arrangement that purely benefited him and his attempts to pay as little as possible (no tax returns) hence the new arrangement .The gov cannot force him to back pay me for past non payments prior to gov agency collection and he refuses too, so asking for him to pay via a private arrangement was met with verbal abuse As she is turning 18, I will loose all entitlements for her but still have to financially survive for another year and a half while she completes her year 12 studies . As she has yet to finish secondary school she is not entitled to new start or any other Centrelink benefit . I would like to know what my chances are of getting the courts to grant me child support for another year until she has completed secondary school .She would be classed as an Adult child because yes she is 18 soon? What is the procedure I would have to follow to apply to the court system ? Do I have to retain a costly solicitor or can I apply to the courts myself ? He left the family home, there was no mediation and I can't see it being possible now, his income is 6x mine and still he will not assist with his children's lives other that to pay child support e.g. no help with school fees/books, driving lessons, nothing extra.