According to one my neighbors, they just make it harder for her to do her job (as she understands it).
In my case, I score in the 95th percentile or better on just about any standardized test you cared to put in front of me, but when I finally got free of K-12 schooling I only really had three useful skills:
1. How to take a punch.
2. How to dodge a punch.
3. How to throw a punch.