... Combine are required to take an I.Q. test.  It's called the Wonderlic Personnel Test.

The theory behind the Wonderlic is that the NFL is so much more mentally demanding than the college game that high intelligence can be a predictor of professional success.

However, when economists David Berri and Rob Simmons analyzed the scores--which are routinely leaked to the press--in their 2007 paper , they found that Wonderlic scores are all but useless as predictors of how well college quarterbacks will fare in the pro game.

For example, of the five quarterbacks selected in Round One of the 1999 NFL draft Philadelphia Eagle QB Don...

Read Complete Article at Bleacher Report - College Football