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<p>In a way, and then probably not so: </p>
<p>You can and probably ought to have applied to MIT as a Junior. Although not highly recommended (maximum hs prep is preferred), there are universities who take in very qualified juniors, granted that they have exhausted their course offerings at school (this would usually but not necessarily be in the case of high schoolers who had been home-schooled previously as their education).</p>