You can, there are early entry schemes, and another scheme where some unis only require you to get a certain band in certain subjects, i.e. wsu true rewards, mq academic entry program , etc.
I've done a few HSC past papers but just wanted to see the trial papers from schools and if there was any common topics/questions, and also to practice them since trials are supposed to be harder
I think the main issue was that almost half of the exam consisted of longer questions/application questions, whereas in most of the trial papers there would be around 2-3 application questions