The other accident which someone told me, was that of a drunken student pilot (I may be mistaken), someone told me that the student was from Basair but again I may be mistaken.
However, if you are looking for a school, in the end all schools have a record whether good or bad, wheatbix details everything you need to find a school that will suit you.
You already have the options there, and once you arrive to Australia, go to these places at Bankstown, and if you would like to live somewhere close to the school, be sure to know that public transport in Sydney is not the best in the world, it will get you to A to B but it will take you long and maybe expensive.
Another thing, I have been hearing stories from Indian students at my school that it is sometimes not safe at night at Bankstown, be sure that you know the neighbourhood (hopefully at day time).
I wish I can help you out more, but my sources are very limited, so all the best for your choices!