Don;t work yourself up about being humiliated, it is not useful since you cannot get the test graded at this point (and I doubt a room full of high schoolers who may or may not know you would be anything remotely like libel … and you did break some arcane but real rule of CB).
If anyone asks you can explain what happened, but don’t go over the top. Life is not always totally fair … and it will work out in the end. What you can ask is that CB find a place for you to take the test in Jan.
If you even bother, the 4th test is unlikely to be much different than test 1-3.