I get that, but my question lies in the following scenario:
1. I get an email notifying that if I set first pref to a certain course I am guaranteed to get in.
2. I'd rather get into my true 1st pref, but I know my chances are low.
If I keep the preferences as they are, and assuming my first preferences deny me, will I still get that guaranteed entry even if I didn't set it to 1st preference?
I.e. does the uni know what preference you picked a course and can that influence you getting in?
Universities will not know your preferences. They use a middleman, i.e. UAC (for NSW), to distribute offers. UAC looks at your preferences and start from your first preferences. If you meet the criteria for a specific university, you will get an offer. If not, they move to your next preference, and so on until you receive an offer or your preference list is exhausted.
What I suspect is happening (could be wrong) is that you will receive an offer in the 'early' rounds where if you put that preference as number 1, you will receive an offer. It's possible, but I'm not 100% sure, that UAC only looks at your first preference in the early rounds, and this is why that university has asked you to put it as your first preference.
If that is the case (i.e. this is for an early round offer), then you can still receive an offer for the early round, then change your preference list for the main round and late rounds. In most cases, it is best to put your desired preference as number 1.
Now, if this is not for the early round, then I can't see how putting that preference first would somehow separate you from all other candidates in the main round. It makes no sense, unless this is a really niche area that requires say a portfolio.
So, the question is, is this for an early round offer?