Hi everyone, I just finished my Interview and bio together. If you are interested, here is my experience.
I was a little bit late but I was still on time. When I passed the security, it was about the schedule time. I did not wait in the waiting room at all because I got call in before I sit down at the waiting room. We went to her office. The lady was really nice and friendly. She checked my ID and asked me to say the oath (By the way, you don't need to repeat what she said, just say yes). She asked questions like my name, DOB, born place, parents names, and my status. She was a little confused because she saw I am on F-1 but I am working now. I think she probably thought I was unauthorized worker so I showed my EAD but she was still asking if my EAD is based on my DV case or not. I said it is my OPT authorization. She asked her supervisor to come in and he explained to her that I am still in status. I am still wondering why she was confused. She also asked my military service back to my country and she went over I-485 questions. Then, I sign the paper and she asked if I finished my fingerprint yet. I said no and she brought me to the waiting room. She went to ASC and asked if I am available to do bio on the same date. I got approved and did the bio. It was really quick. The time I spent in both bio and interview was only 30 mins. I am surprise how fast they deal with each case. After bio, she told me she will approve my case once she got the bio back. Overall, I think it was a good experience.
Tips for what I learned during interview:
1. Don't bring too much unnecessary stuffs to the interview because it will slow down the security check.
2. Be there early. They may call you in before the schedule time
3. Make sure you memorize the date of everything (such as last time you arrive to the US or when did you move or so on). I forgot the date and year so I need to check my documents to answer the questions
I also have one question though: I can't remember where I saw this information but I saw people saying that if you serve in military in other country, they may process the bio for a long period of time. Is that true?