I went to rank 580 school and I did those subjects.
Point is - if you think everyone can do subject selection xxx and then get ATAR of 95+ or whatever, I think that's wrong.
If you think that's wrong - then I challenge you to go to Plumpton High, down the road from my high school - and then you look me in the eye and tell me that all of them are capable of 95+ if they do those subjects.
The fact is you need a certain level of natural ability and/or interest to do well in some subjects. If you possess neither of these, its likely you won't get an astoundingly good mark regardless of the amount of work you put in, particularly in more difficult subjects such as 4u maths