Share accommodation in Canberra can be cheaper than living on residence. I looked at a place today that was around $90 a week rent. If you lived very carefully you could afford it with just a part time job and have enough time to study. If you really want to pull it in you could spend only around $30 a week in food, but your main meals would be homebrand pasta and rice dishes. Get a bike and ride to uni, and you could live with $150 a week. It would be tough though.
Finding a place that cheap that is livable can also be hard. I generally pay $140 - $160 for an alright place in an alright location, but if you want to live centrally the quality goes down and the price rises - just generally, there are exceptions. If you wanted to live out Tuggeranong or maybe Gungahlin you could find better houses for lower rent, but then you have to travel, but bus travel in Canberra is quite cheap, we don't have zones or anything so it will cost you same if your close or far.
Alternatively, occasionally you can find families or elderly people who will let you live without paying rent for 5 - 10 hours of housework - or even nannying. Its less time working because you don't have to travel and you could do an hour of work everyday instead of big chunks. That way you wouldn't have to work long hours somewhere else. There might even be a business that does this.
They are my only real hints, sorry that they aren't that great.