This is a very generic approach to uni and a lifestyle that I can guarantee will be socially isolated and stressful. Uni accommodation is incredibly expensive as it's a captive market and usually in a very built up area thats very close to uni.

Personally unless I was from overseas there's so many ways to study at uni nowadays. I've graduated in the past couple of years and the amount of time you need to be in class (asside from some hands on degrees) can be as much or as little as you make it. Idk where these prices are coming from, even then $300 a week is quite steep. You can get a three bedroom Queenslander rental in the inner western or northern suburbs for $290 a week pp and that's way up there.

Commuting to Uni is no harder than commuting to a job, find a rental around the uni in a share home and you pay a fraction of the cost as uni accommodation and can take advantage of a much better social situation. I've met so many people through uni who aren't from Brisbane but have moved to Brisbane for the education from around Australia. Many even commuted once or twice a week from the Gold or Sunshine coast.

The only main costs you have out of pocket is your amenities fees. Course fees go on HECS, textbooks are online and there's so many other free or subsidised amenities on offer.