AceHsc has a couple 2021 stuff but mostly without solutions. Have you tried doing task 1, 2 and 3 for maths in the meantime?
they haven't really been posted by schools so I doubt many will be online. and acehsc has only scraped the ones from BOS resources; so they don't really have any 2021 trials yet.
have you done 45 papers for Maths? for physics, I would suggest getting a copy of strive.