if you are scheduled for an I485 interview, things kept in mind:
1. bring all documents proving your relationships to teh interview.
2. if you are interviewed in NY, Garden city or New York city Manhattan usually allowing one your temporary stamping on your passport.
3. if you interviwed is not passed. you may be referred to an Stokes Interview. detailed interview regarding your life together, you may or may fail the interview depending on how well you prepare. I have clients both passing and failing Stokes interview.
4. Marriage greencard is the fast but also the hardest one to pass.