Technically you could drop up until the day of the hsc exam. Going from advanced to standard may give rise to the issue of learning more content etc, the option is still there nevertheless.
If the university degree that you’re going for doesn’t have any ‘assumed knowledge’ then you’re sweet.
Hydrogen as a fuel source is much cleaner for the environment, and is pretty much equivalent if not better (especially with funding towards it in the coming years) than electric (battery) and other current options. There is a projected abatement of 509,000 tonnes annually of carbon emissions if...
If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any time