I found this in one of the Reflection Statement post, if you are still unsure exactly what to do with the invisible 'sixth dot point' then you should probably check them out:
The student is to show that the knowledge, understanding and skills developed in the English (Advanced) and (Extension) courses has been extended and refined in the Major Work.
Now that sounds nasty, heck it even looks nasty - but its not. You basically have to acknowledge how your work has extended ideas you've been exposed to in Advanced and Extension 1 in both preliminary and HSC years. Given that you've probably been exposed to 8 different modules of English you have a wide range of topics that you could discuss but you probably only need focus on one area and make those links. Hopefully though, the links you make will be more substantial than 'Ext 1 taught me how much I love writing' (and while that sounds like a given, people have used that as a link:/). And thats probably it for that.