If you would refer me to such generous scholarships I would like to see it.
Well I really have no idea who you are/what you do/if you are a guy or a girl - so it is extremely difficult for me to have any idea what scholarships (or even colleges, since some are single-sex) would apply to you. However all the usyd colleges (St Andrews, Paul's, Wesley, John's, Women's, Sancta and International House) have scholarships available - the amounts and what they are awarded for all vary.
Here are a couple of websites for the colleges:
http://www.stpauls.edu.au/node/52 ;
http://www.standrewscollege.edu.au/?/About The College/Academic Program/Scholarships ;
http://thewomenscollege.com.au/scholarships.php
However, whilst there can be very specific scholarships (indigenous, engineering, rural etc) there are at some colleges also just general scholarships (for example, at Women's college they are just titled 'Women's College Scholarships' and are available for people who don't fit into the specific scholarship categories. They can be awarded based on merit, financial need, if you live out of sydney, involvement in college life etc etc and the amount that is awarded depends year to year - basically its up to the discretion of the scholarship committee and how much money they have available for scholarships. They can be anywhere from $1500 a year to $6000 almost half fees).
A scholarship might not cover full board (they are rare), however it may help subsidise it enough so that you can work to pay the rest, or if you parents are happy to help support you, then that might also work.
I just wanted to point out the different options - I'm not presenting a magical solution. Personally, I had no idea colleges existed when I was finishing highschool, and I ended up having friends in them, and moved in in second year - it was a very fun experience.