<p>I'm pretty sure that anyone can take the AMC 10 / AMC 12 (well, you have to be in 10th grade or below to take the 10).</p>
<p>And then taking the AIME and the USAMO depend on how well you've done on previous contests.</p>
<p>I'm pretty sure that anyone can take the AMC 10 / AMC 12 (well, you have to be in 10th grade or below to take the 10).</p>
<p>And then taking the AIME and the USAMO depend on how well you've done on previous contests.</p>