How long is the wait for F2A category. Any other options to come to US, even as dependent or student.

It is almost impossible to predict when changes will be made to the visa bulletin. At this point, all you can do is be patient.

Do green card holders who live in another country have to come every 6 months to maintain it, or can it be more spaced out

Your mother should not space her trips out. In fact she may be in violation of her green card if her primary residence is abroad. Not only should...

Should i inform or not for change address to uscis?

Generally you are required to report a change of address within 10 days of moving. So it is best to give the new address on the form Ar-11

If at the age of 20, I get my F1 Visa approved, do I still come under dependent till the age of 21 ?

Given the recent Supreme Court ruling it is best to meet with an immigration attorney to discuss your case.

Can I travel outside US while my Naturalization Application N-400 is still pending?

Generally you are allowed to travel while the application is pending. However it is a good idea to make sure you have your biometrics done before...

If I have one 485 application pending under Employment based category can I apply another 485 based on family based (F4) ?

You can file the family based green card as long as you are eligible.

Does the employer have to be E-verified in order to legally file fresh H1-B petitions for its employees?

At this point, the H1-B employer does not have to be E-verified but that could change.

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Can I cross the border into canada with a disorderly persons offense in nj?

It would be best to consult a Canadian immigration attorney about your conviction and its possible consequences.

Can I bering my wife to usa

I assume that you have an immigration attorney that helped you obtain asylum in immigration court. Generally a proxy marriage will not be allowed.

Need to know thanks

The I-485 should have its own receipt number.