A driver license may be revoked or suspended for:

There are number of causes for which a person's license can be revoked or suspended in Tennessee. Among these are fraudulently altering a driver license or receiving 12 or more points on a driving record within a 12-month period. Drivers under age 18 may receive notice of license suspension or revocation if they acquire six points within a 12-month period.
DMV Writen Test