Pretty sure you have to do A LOT of things to get an early offer from USYD.
1. You had to apply for the E12 scholarship program way back in, I think August or September can't remember
2. Get a conditional offer in October then fulfill the requirements stated on your course. Eg.Minimum ATAR of 90 and Band 5 in English
3. Get a confirmation email, an invitation letter and an Info Day program in the mail from them when results came out
4. Put the course as your first preference by yesterday and THEN you get your unconditional offer tomorrow morning