Last minute much? Application process is a bit annoying imo with the different application forms. UNSW has an application form that asks you about your experiences and personal questions I suggest you get onto that asap.
You can only get one offer per round from UAC. Ie. If in main round you got an offer from unsw med, but you decided that you wanted to do uws (which was your 3rd preference), you'd reject your unsw and then the computer would (if you're eligible) offer you a spot. (note that there is no guarantee of a 2nd round offer). You will only get offered a spot for ONE course in each round - the highest preference that you are eligible for.