hey Arjun can you please post little more about your case? like priority date, DQ date and when did you receive interview letter? to answer your question, 1. take all originals and a copy of the applicants document that you submitted to NVC to get DQed 2. take copy of petitioner docs that u submitted to NVC 3. take as much proof as you can to prove your marriage is genuine for instance, marriage photos, bank details if joint account, or if life insurance has one of you as nominee.. these are not compulsory but they make your case stronger