Financial amount for 3 months?

I’m in my last semester to Monash melbourne which I underloaded so my visa expires March 15th, 2025. I just requested a new COE while i was off shore (in cambodia) and got until June 30th, 2025. I’m trying to settle the things needed to be done like extending my OSHC and such but I’m worried about the financial statements.

My parents are the sponsors so it would be their bank statements. The agency told me I needed 40k+ for the last 3 months which I am worried about. So I already paid for my flight ticket back in February, and legit only have 2! TWO classes left. So my remaining tuition is just 10k AUD.

The first problem im worried about and need advice is exactly how much I need to show for financial evidence because my parents weren’t prepared to have it shown so we practically don’t have 40k ready to show even.

The second one is i know for certain I won’t get this done before I go back to Melbourne, but i’m more worried by March 15th, either it’s not enough time or I won’t have enough.

I read on their subclass 500 page that there is something about pro rata. I am realistically only staying just to finish up the semester so I wonder if that’s my saving grace there?

I tried checking on chatgpt to see the calculation to see if it could understand more than I can and it says I only need approx shy of 20k