There really are no stupid questions, we didn't wake up knowing this stuff one day, we had to ask it just like you did.
The requirements to get into a bachelor of science vary from university to university so you need to look into the individual prerequisites.
I don't think its too late to change your VCE subjects if you wanted to be honest. This is probably just the basic preliminary stuff.
It seems like you have diverse interests, which is great but with year 12 dawning, you need to make the (sometimes painful) process of working out what you want to do. You don't need to stick to it for life or even for ever but you really need to start narrowing down your options and being realistic about it all.
You haven't done any science subjects which i find a little concerning. The way things uni work is often rather different from that in VCE. Right now, the most science you've experienced is year 10 science which is fairly different from VCE, let alone uni. I say this not to discourage you but people often go in it based on false perceptions of what uni is like or what it is like to study subjects in uni. Compare year 10 SOSE or English to what you do now, did those give you an accurate perception of what you would be doing now? In most peoples cases, i don't think so.
If you do want to consider science, it might be worth at least narrowing down the area a bit so you hae some general direction.
As for the Deakin thing, its not really that strange. Monash science doesn't require math either, i guess in the recognition that many fields dont need huge amount of pure maths, especially in biomedical type fields, basic math and statistics are all you need. Any degree is worth doing compared to no degree. You can use the deakin degree to get the prerequisites you need and transfer to another uni for science if you so choose as well.