I am about to file for a U visa application. Can I leave the country while my application is pending, I have an F1 visa?

Departure while a change of status application is pending generally means the application is abandoned.

Residence question in form I-821?

"Residence" is a different concept from "presence."

What is a reasonable fee for a BIA appeals case

You should consult with a few immigration attorneys in your area for that information.

Multiple H1B petitions

The first petition's approval would not be invalidated automatically by approval of the second.

H-1B visa and 1 year cool off period after 6 years

If you have spent a full 6 years in the US in H-1B status, you will have to depart for one year.

Can I go to Canada/Jamaica/Mexico to get F1 Visa? I am on H4 as of now.

If you are not a Canadian resident, this may not be possible. Consult with an attorney specializing in consular processing issues for TCNs.

Out of Status for more than 5 months f-1 visa student . Will I be able to re-enter with a new I-20 ?

You should not be barred from readmission for "unlawful presence," however any previous lapse of status can cause a "problem" for subsequent...

MStatus Maintenance RFE?

You will need proof of continuous employment, which could be paystubs or other explanation of status during the period in question from the company.

No. You would have to change your status or depart and seek readmission as a visitor.

Changing jobs between I-140 and I-485.

I would not recommend that you make your decisions based on the limited information you can obtain via AVVO in response to the limited information...