I'm not quite in Yr 10 (Yr 9), but thought I'd share my opinion anyway.
Currently, It feels like my ATAR will determine how the majority of my life will play out, especially in terms of occupation. It seems like a very important thing and feels like my entire life depends on it. My aspirations, dreams and goals all seem to be reliant on one thing: my ATAR.
VCE seems like the thing that I've spent the past 10 years of my life in school for. Despite this seeming wrong, I feel like ATAR is basically your 'rank' in our education system; the ULTIMATE exam grade and the most important too. There have been points where I have had breakdowns by just worrying about VCE, my VCE subject choices, if I'm going to be able to get a high enough ATAR, what I would do with my life if I didn't get a high enough ATAR and what not. But, when I look at the bigger picture of life, it seems a bit less important but still crucial in determining whether I am able to turn my dreams in reality.
Just the paradigm of a Yr 9 on ATAR. : )