copyright probably would be an issue; however, there is a slight chance that you could be asked to write from a character's perspective, if that counts.
lol. don't.
you don't know the meaning of panic yet.
frankly, if you chill a bit you may find that you'll do better than expected because cortisol isn't fucking with your ability to think clearly.
and i don't remember getting a formula sheet for the sc.
you can book study rooms at some libraries.
or if you can, go to the state/mitchell library. any noise in the latter makes a loud echo, so it's usually deathly quiet save the odd cough/sneeze/etc.
or there's blue tack earplugs.
you don't have to be going out to put out.
in answer to the question, i do whatever i feel like. there shouldn't be any rules regarding it.
the physical side's easy, it's the actual connection you should be worrying about.