Sorry I don't know & you’ve finished the HSC now, but I must say, I am horrified by the absolutely uncalled for rudeness towards your post.
I feel your question was more than valid. It's totally despicable that people responded like they did. If people are on an information sharing site, most likely they are members so that they can also “use” other people’s information.
Information sharing happens in the real world. It’s called collaboration & it’s how society functions efficiently and progresses.