You can go back to F2 status by traveling and re entering using your F2 visa. No form I485, or I539 needed.

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Green card medical exam normal ?

Maybe only because you seem to worry about things too much. :-)

Mentioned length of Employment in DS 160 for H1B Stamping

Well, did you work during those dates? If you worked without authorization then talk to a lawyer. It sounds from your posting that you are asking...

After how long can i come back to the United States on a B2 visa?

If your mother is sick, maybe you can extend your status without leaving. You would need evidence of her illness and your available funds while in...

Can I ???

This difference in processing times is small, its not reliable and it can change. So, moving for this reason is not worth the trouble.

Im applying for naturalization to become a US citizen online. In case of an emergency do I have to join the US arm forces??

How did you miss selective service? Under the law, virtually all male U.S. citizens, and male permanent residents living in the U.S., ages 18...

Whats the process? How do we start?

Because of the overstay, make sure you use an attorney to file your case. Overstays are typically fine in immediate relative (spouses of US...

I sponsored my wife for green card which she recently received. Now I want to give up my own green card and switch to G4.

Sure, should be fine. G-4 status has its benefits so it makes sense from that perspective. Maybe you want to talk to an immigration lawyer about...

Is this an immigration attorney area of expertise? Matching an applicant skills to the more LC approvable job type.

Hello. I think it makes sense for you to meet with an immigration attorney and go over your credentials, immigration history, etc.. and advise...

Will she become a citiZen immediately since the person adopting her is one himself

Adoption won't work but she may qualify for DACA.