Can i petition a denial of dv visa application

Potentially, but there is an enormous hurdle overcoming the doctrine of "consular nonreviewabilty" in the Federal Courts.

H4 to H1b filing using I140 after completion of 6yrs H1b term.

These questions are quite complicated, warranting a consultation with an immigration attorney from your end before making any decisions.

RFE withdrawal response timeline

The premium processing time frame applies to the time USCIS should take for adjudication, not necessarily withdrawal and denial.

If want to apply for adjustment of status later, must I or family be in U.S while filing I-140?

Generally, you need not be in the US when the I-140 is filed.

Can a H1 b petition currently under RFE be transferred to new employer

You may have a serious problem with this strategy if the petition was cap-subject and is denied.

What is best option between fiance visa, spouse visa and consulate processing for applying green card on dependency?

Unless you intend to be domiciled in India yourself, you are looking at either a K-1 fiancee visa and adjustment of status after marriage in the US...

What's the process for a nurse to get a greencard?

You need to find a US based employer to file an immigrant visa petition on your behalf, among many other requirements.

Can I get married and live separately 5 days a week?

This would be an unusual arrangement, so you could expect a great deal of questioning regarding the bona fides of your marriage.

Hi am in F1 visa (OPT) working with A, my H1 approved with A. Is it possible to change my employer before October?

You can work for whomever with your OPT at present. The new employer could also petition for you to work for them starting in October under H-1B...

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Can one change the information on his or her DS-160 even after an interview. Thanks

It is much harder to change after an interview. Any material omissions or misrepresentation can give rise to inadmissibility due to fraud.