Only you can motivate yourself
So think of goals? ambitions? What course do you wanna get into? How badly do you wanna get into it? What would happen if you don't get the ATAR (wasted time, transfers etc)? Just use that to motivate you to try your absolute hardest to smash it so you can comfortably enter the course you want without the struggles of pathways. Or maybe you can aim for scholarships?
Are there people you will let down? Do your parents want you to do well? You can't let them or yourself down. This is the culmination of 1 year of (presumably) hard work! Don't slack off now!
And think about it - in <1 month HSC will be over. You know those people who finish exams and come out thinking "oh god that was so easy but I wish I studied more and I could've done better" YOU DON'T WANT TO BE ONE OF THOSE PEOPLE! YOU WANT TO BE THE PERSON WHO COMES OUT AND CAN CELEBRATE GUILT-FREE AT THE END BECAUSE YOU KNOW THAT YOU GAVE IT YOUR ALL AND NOTHING LESS!
Make sure you come out of this HSC block with no regrets and make sure you can be proud of what you've done! Don't worry about the amount you have or haven't studied - what you do with the 6 days we have left is what will make the biggest difference
GOOD LUCK WE CAN DO THIS