How should I go from F2 to F1?should I apply from here or I should go back my home country and apply the visa from there?

The COS is possible in the US, however, the time to process may take too long. You can check processing times on the USCIS website.

Medicare is limited and would generally not be available. Insurance under the affordable care may be possible.

Can minor Child accompany with parents to enroll in US school?

A child may obtain F-1 student visa for University level or for approved High Schools.

Does a child who was born overseas to a U.S american citizen automatically become a U.S american citizen?

She should have the birth abroad registered with the US consulate and apply for a US passport.

L1B to L1A conversion.

A new petition may be required. Discuss with your employer's immigration attorney.

From the information you provided, it is likely that you are a priority immigrant and not presently eligible to adjust status. You do not provide...

Does petitioner is required to return to US when his wife is under treatment after brain stroke for immigration of daughter

Depending on the issue if it is the petitioner must establish residence in the US you will need to present evidence establishing the taking up of...

I765 Section 11 wrong entry.

CIS is taking longer with many adjudications than than have recently. Be patient.

You need to reside in the new jurisdiction for 90 days before filing

Can I travel to my country and come back to US if my husband's F1 visa expires while as F2 I have 3.5 years of visa ?

The F-2 is dependent on the F-1. When the F-1 ends so does the F-2