There are specific forms that are needed to bring to your interview, take those with you and place them in a separate binder. In another binder bring all other documents that were needed during your AOS/ROC etc. It's best if you had them and not need them than having a no decision for weeks/months/years, receiving RFEs and waiting for another interview. Some IOs are pretty quick, others want to dig if they see a red flag and you want to put out those flames immediately by having supplementary evidence with you to corroborate what you say. Always go over prepared and be organized in case you need to fish for some obscure document. Just remember to respond only to what you are asked and not to volunteer information that was not asked. Good luck.