The Wonderlic Test is a standardized testing system that is used in a variety of industries, but, perhaps, most famously at the NFL Combine. Participants are given the test, and their scores are, generally, considered to be a measure of a player's ability to learn, adapt to and understand the systems, plays and schemes used by NFL teams.
A high score is desirable but not necessarily a determinate factor - a low score, however, can serve as a "red flag" to scouts and coaches.
Generally, Centers score the highest on the test, and running backs score the lowest.
How would you score when put under the pressure of 50 questions in 12 minutes? Well, you can find out (either by playing Madden NFL, or) by taking the test on the Wonderlic Website.