So essentially, there are 2 components to your HSC mark: the Examination mark (how you perform on the day of the exam) and your Assessment mark (your internal mark after moderation). Let's forget the examination mark as that will belong to yours, and is solely dependent on how well you perform in the HSC. Ultimately, the main goal with internals (which you will not be able to control anymore) is to achieve a high rank as moderation will result in a boost to your internal performance. Ideally, you now want to be focusing on your externals exam (which is still 50% and can definitely boost your overall HSC mark given a strong performance). Scaling is for externals only (as mentioned above) and is established by how difficult the exam was (so well out of your limitations).