when i was in yr 12 i did like 5 maths ones (mostly in class), a half of an mx1 paper, and 1 chem paper and my ATAR was 95.1 okay and when i wrote this on bos and said that i had only studied some topics for each subject (3 days before the hsc) people laughed at me and said i would fail but i didnt so lol.
moral of the story: you dont need to do 736785632 past papers to get a high atar. lol @ azns who do 20 past papers haha