HI first of all I am from Thailand, 17yrs My f2a case complete since April and NVC scheduled for me to interview at local us embassy on 16 this month at 08.30 am I am so worried can u guy tell me some experience for F2A minor child of LPR, Like the possible question they will ask and they request me to bring financial evidence include my dad i-864 and my co sponsor 864a with their tax return. Will RFE make it longer because it retrogresses on june. And should petitioner come with me on that day ? Thank and sorry for bad english.

If you have an interview scheduled, you should be fine. A google search can help you find out what questions they are likely to ask (search 'consular interview questions' for instance). All of your financial documents must be brought to your interview appointment. Your interview appointment letter should explain all of this, including what documents you need to provide. If you do not bring all required documents, you may not receive your visa. You can always email the embassy if you have questions regarding preparation for your interview.