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<p>Most (perhaps all) US universities will not allow this. If you have previously enrolled at any other university you must apply as a transfer. Which will significantly lower your chances at Harvard, since they take very few transfers.</p>
<p>The only way you could apply as a beginning freshman would be if you lied to the US school and said you never went to any Australian university. And I do not recommend lying on your application, because you will be summarily kicked out if the US school ever discovers your lie.</p>