IME, some of the prior answers are fine for a competition, but a test session doesn't require as many volunteers or roles. I'm the main volunteer coordinator for our competitions, but our test chair recruits volunteers for the test sessions. Our club keeps test sessions simple and low-key, which I appreciate.
Here are our volunteer roles for a TEST session:
. Test Chair - responsible for everything and ours is an elected official. (And one of my fav adult skaters) She prepares the list of test-takers and verifies current membership/eligibility status. I believe the Test Chair prints out the judges' sheets for the session and afterwards, sends the official results to the USFSA and makes sure that they are registered properly.
. Test Schedule - Again, unique situation; our Referee makes up the judges' schedules and assignments. I believe she recruits the judges as well.
. Hospitality - our sessions run early Sunday mornings through lunchtime, so having coffee and breakfast for the judges in the morning, a simple luncheon at midday. They coordinate the setup, cleanup and judge's comfort/access on the ice. (Blankets and heaters, chairs or ramps if needed)
. Accounting - our test chair handles the accounting because our sessions aren't that big. At larger sessions, clubs recruit a volunteer who checks the math on the sheets and verifies the pass/retest scores. They also make sure all the forms are signed and create skater/coach and file copies as needed.
. Results - Our test chair or club president discreetly distributes the results to the coaches/skaters.
. Music Monitor - during the freestyle or ice dance tests, a volunteer will man the CD player and start/stop the test music as instructed by the referee. I've done this and it's coooooold! I didn't notice the heater under the desk until the next-to-last freestyle skater, lol. We don't announce anything, it's just "Put in the CD, wait for ref to nod, push start, eject when it's done. Repeat."
If you want, I have a list of competition volunteer roles with descriptions that I can post separately.