There ARE la bro but question is: Will getting a PPL really give you an edge over other candidates? There are cases too where candidates with PPL or even CPL did not get through.
Do you meet the educational and physical requirements (eyesight in particular) ?
If yes, congrats, good chance. My advice would be to read more with regards to aviation, follow the news a bit and of course, SIA's progress. With regards to flying lessons, go there to have a good feel to what flying's all about. It will also give your confidence a boost if you do not feel airsick and are able to control the a/c to a reasonable degree. This shows that you have aptitude. Some of my friends went to elite for a few lessons (about 10) and subsequently, they were all accepted by SIA.
Do take note as well that going for flying lessons leave the interviewers with MORE things to ask. They will ask you questions like how you go about doing a pre flight check, how do you recover from a stall, how can you recover from a spin, what's the difference between a stall and a spin. Basically questions relating more to flying because you have some sort of flying experience already!
Last but not least, if you have a PPL, that will account to some reduction in flying hours in Jandakot, Perth. Oh well...too complicated to explain now, will leave that to another day alright?