First of all, take a deep breath. Sure I understand it can seem daunting, but if you have studied the 100 questions, you should be fine and probably have a better grasp of US civics than many who were born here. I am not sure there are common questions, and it would be hard to compile a list of those, so you just need to know them all.
As to documents asked for, in my wife's case the IO did not ask for any documents. Also my niece and nephew that came over on DVs recently naturalized (5yr rule) and they were not asked for any documents.
Good Luck!