<p>As a 2400 (who retook from 2380), I think I can weigh in on this.</p>
<p>2400 is not luck. The practice tests give you a range of scores based on your results. There’s a reason for this. I think this is roughly the breakdown:</p>
<p>2400 Probable: Take the test 100 times, you’ll never get below 2350. The vast majority of your tests will be within a question or two of 2400. Most 2400’s come out of this pool.</p>
<p>2400 Possible: Take the test 100 times, you’ll always be in the 2300 range. If you’re having a really good day, you could get 2400.</p>
<p>2400 Remote: Generally in the high 2200 - low 2300 range. Maybe hope for a miracle.</p>
<p>Anything else: You would have to be unbelievably lucky.</p>
<p>What determines these ranges? Practice, bounded by the limits of intelligence.</p>