<p>Three sittings, each of which records a 200 point improvement, might not be so bad in the eyes of admissions officers. However, scores of 640 in the CR and W are still quite low compared to many other Australian/Korean applicants, especially given you’ve been living in an English speaking country for the past 9 years so poor English will not be considered an acceptable excuse.</p>
<p>I’m also Australian (from Sydney), though I’m not Asian. Most other Australians I know sit the SAT once or twice only; multiple sittings is the norm for Americans, but for Australians who have an entirely different system to contend with, sitting the SAT multiple times can look like you are trying too hard.</p>
<p>You have to also remember that the attraction of the US is that it offers a liberal arts education, not the vocational foppery that is available here in Australia. That means that a business-oriented student is not necessarily suited to the US, unless of course you go to Wharton or some other undergrad b-school.</p>
<p>Another thing is, they are going to see various ECs that imply you are an excellent communicator (all that stuff you are president in, and your debate and work experience), but they are going to see a large discrepancy between that and the standard shown in your SAT scores. Do not try to present yourself as being weak at English, because that will simply call into question your actual contributions as part of your ECs.</p>
<p>In any case, best of luck with your application, and I hope you get into Columbia ED.</p>