I have also same sorts of documents as Amarpuri6 has listed.

I did not have Bank statement. I don't think this is needed. This may be good to have but not required.

You may carry all your I-20s and EAD cards with you but no need to place in the documents file which you present to Counselor. you can keep them with you in case needed.

That's it, just keep calm and answer all the questions honestly. you will be good.

Once you get your H1B Visa, don't forget to go to Foreign Employment Authorities office to get the Foreign Employment letter that you need to present at Airport while returning.

All the Best!