From LASORS 2005:
The Skill Test shall be taken within 6 months of
completing the flight instruction. All sections of the
Skill Test must be completed within 6 months. The
Skill Test has a validity of 12 months for the
purpose of licence issue.
So you should be fine until Dec 05.
The six months you were thinking of was probably the time limit from completing the course to actually taking the skills test.