While obtaining your driver license, you may:

If you are 18 years of age or older, you may choose to become an organ and tissue donor when obtaining your driver license. If you are a male between the ages 18 and 25, the DC DMV will register you with Selective Service unless you use a waiver form to opt out. If you are a citizen of the United States who will be at least 18 years of age by the time of the next election, you may register to vote or update your registration.
DMV Writen Test