Everyone,
Stop throwing hypothetical upon hypothetical. The HSC comes down to two things, whether you know the content and whether you can apply it. If it takes you two days to learn the content, so be it. If it takes someone 50 days to learn the content, so be it. You still know the same content and no one has an advantage over another.
If you've done nothing all year, it doesn't matter. Just learn the content. Get notes, textbook and learn it. Then do some practice questions. If you haven't made a generic essay or a creative story, write it. It takes a few hours, and don't be a perfectionist about it. Get it read or edited by someone else, make it decent and move on.