Getting RFE for I751 at N400 interview makes sense. The I751 requires adjudication before adjudication and decision on N400. "RFIE for N-400" makes...

There is no restriction on renewing passports while 4EAD application is pending.

A TN visa holder can move to the US under TN visa and work remotely for the US based company.

All marriage and divorce documents of your mom are required. Submit all supporting documents for other AOS application.

Processing for USC spouse is faster because it is immediate relative category and visa is always available. Other categories are preference cases...

You may not continue work with employer, when your marriage-based AOS is approved.

It appears you are a USC petitioner for your sister beneficiary, in a 4th preference case.

You need additional information and background. I think it matters who is requesting test and why for meaningful answer.

There may be some options. A public forum may not be the approach for you to follow. It is best to consult with an experienced immigration lawyer...

You requested by writing "Please help us we need work permit." If you are qualified, your lawyer may help with that. There is an eligibility...