I-130 TO I-360

The most recent i-360 took about 10 months for USCIS to adjudicate. Published processing times reflect that timing.

H1b extension beyond 6 years

Company B may utilize company A's I-140 approval for 3 year H extension until the I-140 is revoked.

H1B with PERM in process, is it possible to move to F1 status to do MBA?

It is possible to retain a I-140 priority date for Green card but leave H1B status and get F1 visa to study full time MBA. A change of status may...

Green Card Cross charge: What documentation is needed to prove that my spouse's parent is a resident of her country of birth?

The birth record of a parent establishes place of birth.

The birth record of a parent establishes place of birth.

Petitioning Adopted Sibling

Generally, a US citizen may file an I-130 for a brother adopted before 16.

How big is the package to send with i130?

You may provide the forms and proof of citizenship, marriage, and birth certificates with our without additional evidence for Consular processing....

F1 & i20 expired years ago. I'm getting married. How difficult will it be to adjust status?

You are right to be worried about ICE and DHS. Still, a person lawfully admitted as a F1 student and out of status sponsored by a US citizen spouse...

B1/B2 - visiting US within short period

There can always be an issue with immigration. Still, a person visiting for two weeks than seeking admission for 6 months is possible.

I751 Cruelty waiver and reconcilation?

The I-751 Waiver is the least of your worries.