Silugadi,

No reason to fret, but you should try and find yourself a sponsor (if you don't have a legitimate job and tons of savings, this is a must) have them fill out the form I-134, I-864(Affidavit Of Support) is NOT required.

Ask for their tax retunrs for this year and last year as a backup. You will take all of this to the interview. NO NEED TO MAIL it to them.

Make sure you get your twelfth grade diploma (provisional certificate and mark sheet should suffice). like I said earlier, the only thing they care about is the 12th grade, undergrad and master's transcripts etc. might help but they are NOT mandatory (EMPHASIS ADDED).

Good luck and post your experience after the interview is done. It would help a lot of people looking for 411 related to DV AOS.

Thanks