UNSW reserves 10 places in medicine for people who qualify for the Gateway scheme. According to their website, the criteria are:
- Be a domestic applicant.
- Attend a UNSW Gateway eligible school in a metropolitan area for at least Year 11 and 12.
- Live at an address identified by the Australian Bureau of Statistics as being within the lowest 25% of socio-economic disadvantage in Australia.
- Be in Year 12 or have completed Year 12 in the previous year and not commenced any undergraduate study.
UAC generally informs people whose home address and school are eligible for the scheme/automatically generates an EAS application for them.
Apparently you also have to select "Gateway entry scheme applicant" as applicant type when you fill in your direct application to UNSW.