What's wrong with studying in the library? I find that it helps you concentrate on your own work. You might even be able to find some other HSC students there to study with too.
The library is also noisy, but for me it is a more relaxed environment. I work faster and tend to get more done there. This is probably due to the fact that I have a TV and a bed in my room, so I can just sleep when I feel lazy whereas in the library, you cannot just sleep on the floor. There is also a downside, my library closes at 9:30 pm. It minimises procrastination for me.
I prefer studying at the library; at home I ALWAYS procrastinate on the computer since it is far better than doing homework. When you're in the library you'd feel that there's nothing else to do so therefore you'd feel that you MUST do your work.