I emailed the faculty before and they said to transfer to commerce you need a distinction average and ATAR>90. In all honesty, a high credit average would suffice. I have heard many success transfer stories for USyd before, read the commerce forums.Because I missed out on USyd Commerce by 0.10. (Lol my ATAR was 94.30, their cut off this year was 94.40) and I thought a B.Eco would be the closest possible thing to it. (And the subjects I'm enrolled in are all 1st yr Commerce subs anyway)
I've received an offer from Macquarie last night to do B.Commerce, and might even receive a final CSU B.Policing offer in the final round if I'm lucky (though my parents would most definitely disown me + ground me for the rest of my life if I were to ditch UNSW for MQ or CSU).
So I dunno, maybe I should try Ecos for a year and then apply for transfer to Commerce. But I heard that to get a guarenteed transfer to USyd Commerce u'd need a distinction-average and an ATAR>90.
You should do economics in USyd because the first year subjects are really the same as commerce. You can also choose to do the accounting subjects (the ones mandatory for the accounting major) in your economics degree. I 'think' for USyd, you can transfer internally for commerce in the mid year. Just check the UAC website during April for mid year entry. Good luck