Yes, this might be possible. Go online and book an appointment before you leave the US.

What can i do to take my brother with Down syndrome in us he is over 21 years old?

Except for the humanitarian parole mentioned by Mr. Berman, there is no way your brother can immigrate anytime in the next 10-12 years.

Disposition area of what? Are you looking at a government form?

Can i apply B2 extension twice to maintain my status as my COS to F1 is still pending?

Yes you will probably need to file a new I-539 extension for the B-2 ... AND you will probably need a new I-20 and SEVIS.

Bigamy, 2 wives, is a crime in NY. Contact the police and/or district attorney. PLUS, if he doesn't have immigration papers, he might get...

Can I continue to use F1 OPT if AOS EAD arrives before OPT expires?

No. You stopped being on F-1 when you filed form I-485

Can I file I-485 if priority date becomes current and I am out of USA?

No, you can not file form I-485 from outside of the US. Instead it will be form DS-260 ... to be processed at the US Consulate.

Repeat, repeat, repeat questions are not necessary.

Do I need an H-1B amendment even if I am working in another state temporarily (9 months)?

Yes, the company needs to file a new LCA and an I-129H amendment.

Updating Marital Status after submitting I-485 as "single" but before I-485 adjudication, in EB-1A Employment based category?

How can I correct my submitted form I-485 to reflect that now I am married? If my interview is waived, do I need to open service request to USCIS...