<p>SAT is rudimentary knowledge of what we learn at school. Like Ashraf said, it will only measure a bit. A true genius will be shown after their career starts. A Nobel Prize will determine a genius.</p>
<hr>
<p>Then again at the other extreme, those who don't get Nobel Prizes doesn't mean that they aren't geniuses. Also, many geniuses prefer to keep their knowledge to themselves (which I think of as pointless) but are still smart.</p>