Mechanical student here.

I got severe headache liao, this whole moth I've been thinking and asking around. 

I'm in Melbourne, and I am going to assume Sydney will be similar to Melbourne.

I don't know how well off your family is, but I used to spend about AU$800-a-month.

That was because I used to live by myself, and I didn't think it was worth cooking for one person.

This year I will be living with my brother, so its more worth it to cook for two people. I guess I will be saving money by not eating out all the time.

Accommodation can vary depending on your standards, but generally I'd say about AU$250/AU$300-a-week (excluding bills) for property if you plan to live in the city, and it will get cheaper if you plan to live further away from the city.

Once again, if you have a housemate, living weekly expenses for food, etc will be cheaper. I recommend you get a housemate, as you can split groceries, utility bills, etc.

Not so sure about Sydney's public transport system, the last I went there was like 10 years ago I think, so I can't really remember.

Take it into account this is based in Melbourne, but as I said, I expect Sydney to be quite similar.

And I am not sure what it's like in Perth at all, as like Sydney, I went to Perth also 10 years ago or so.

Alright, now I get the idea.

But can anyone answer my previous question?

Okay la I give a senario.

The employer receives two application, one is from UNSW 2nd upper class and another one is UWA 2nd upper class.

Which one whill he choose?