How long do I need to stay in the US to preserver my green card?

do both. since you are leaving for such a long period of time, do everything you can to show your intent to remain permanently in the U.S. ...

You were out of status if you were no longer studying and stayed for 152 days after the I-20 was terminated. Best to talk to an immigration...

Change visa B2 to F1

Its possible she can change status in the U.S., however, there are advantages to going home and applying for the F-1 visa and then returning to...

Status got changed from Post decision activity to decision for my i129, what does it means? is there any issues? common or what?

A decision has been made, and you will get a notice soon. Thats what it means.

Does a new H1B Counsellor petition (while already having a valid H1B) invalidate /affect the current H1B validity?

This is definitely a question for your new H-1B employer attorney, they can advise you better than us since they know the case information. They...

I married a women from UK when she got her green card she got a order of protection and left she lied about all of it

Divorce? If she has conditional permanent residence she will probably lose it.

Visa status

Security checks most likely. Hang tight nothing to do other than wait. For now.

Best time to visit under B2 visa

Maybe. Be prepared to explain what you are doing here, have funds to support yourself during your stay, and a ticket to leave. Entry is...

Im U.S Citizenship and want to do green card for my mother

It would help if you could narrow down the state where she may have been born in the US. does she have a Mexican passport? Where does it say she...

How is my chance of obtaining a green card?

Impossible to know based on that information. We need to know your education, immigration, family, and work history. The best thing for you to do...