That doesnt mean you can't get a band 6. Don't compare yourself to the statistics.
That's like saying, "That doesn't mean you can't get a 500/500 aggregate score for the HSC. Don't worry that no one else in the history of the HSC has done it before!"
Point is - 60 or so students got a mark above 90 in Standard English. Standard and Advanced English are put onto a common scale. There are, if I recall correctly, around 35 000 who do Std. English.
Yes, we're trying to be supportive - but let's be realistic. Standard English people pretty much don't get Band 6's because they aren't good at English.
If the person was any good at English - he or she should be in Advanced. You know what I think the correct question Standard English people should be asking? It should be "How can I maximise my mark?"
You pretty much shot yourself in the foot when you picked Standard English - so don't even think about getting one, because there's a 99.99% or so chance you're not getting one. So figure out how to maximise your mark - and hey, who knows, you might get a Band 6 on a fluke.
So you want to get as high a mark as possible? Write your practice essays and get continual feedback. Being in Advanced is so much better because there - half the class isn't herp derp - so you can move through material quicker and via the Pygmalion effect, you'll find you do better.