the problem is most standardized tests aren't good at really finding the extremes of the spectrum. There are some proposed solutions to this, whatever government actually implements them will reap the rewards of finding and recruiting the best talent available and nurturing them to reach their potential.

basically what you are talking about is the difference between someone who is very smart, one in a thousand, that can score well with lots of studying compared to a one in a million type genius capable of winning math Olympiads. Most standardized tests lump these people in the same category