You two should of received an email with instructions already.
From some conversations, the questions will only pertain to the EMT role, no fire questions at all. Also, there should be a limited number of civil service questions.
I wasn't given a number but I was told there was a large number of applicants and very few positions that are or will be open. (second hand info)
Either way, do well on the exam so you can get placed higher on the list.
Good luck