I have an idea. how about society promptly executes all those who score below average on the sat or the equivalent.
That would be quite a blood letting as the average would move higher and higher. I wouldn't propose this idea too loudly (even though I understand that you were being sarcastic) as there may be more takers than you think. Some (very well known) companies actually use this method to let go of the bottom 10% of their employees every year.
Logan's Run here we come
over 30 see you run