Genuine refugees are different. The vast overwhelming majority (if not all these boats) are not genuine refugees; they are economic refugees. That is a big difference.
The latest asylum seeker boat to be transported to Christmas Island called for an Australian navy vessel to come pick them up when they were just 23 nautical kilometres off of Indonesia's coastline...
High school is one of the easiest times of your life. Even the HSC is easy compared to what life will be like once you finish high school (whether you go to university or not and simply find a job).
Coca cola is not better than water. Also it costs 50c to buy coca cola cans on special (30 packs etc) from Woolworths and Coles so I assume shops can get them even cheaper. They would still be making a profit on them.