Are science past papers before the syllabus changed useful, or are questions from here more useful than those older past papers:
https://educationstandards.nsw.edu.au/wps/wcm/connect/ad94ad5f-4f41-449c-abdb-d50aab0f67b9/chemistry-2019-additional-sample-hsc-questions.pdf?MOD=AJPERES&CVID=