Unfortunately, you cannot have more than one status at a time in the US.

My mother came from India to USA in Nov, 2019 on visitors visa (B2). Can I extend her visa for 2nd time.

Yes you can apply and COVID-19 is a good reason.

Can I file I-130 and I-485 together?

Under current law it depends on whether she was in status at all times before she received TPS. If not she can’t adjust stays.

How to submit H1B docs to Usics

You cannot change employers in H-1 status until you have that status working for employer A on and after Oct 1.

Can I apply for residence for my step dad if he and my mom have been together since 1999 but married when I was 21, in 2015?

Unfortunately, their marriage must have occurred before you turned 18 in order to get immigration benefits from your step-father.

Had EAD but never worked. How does it impact I485 under public charge?

Under current law there is no public charge issue.

You do not need and cannot get a B-2 extension while a 485 is pending.

Can i leave USA and reenter?

Unless you are going to Canada or Mexico you must obtain an F-1 visa at the US consulate (or unless you are a Canadian citizen who do not need F-1...

What administrative closure?

It means no further work will be done on that case if and until your VAWA case is denied.

How should I entry the U.S?

Your only options are through employment or perhaps investment. You need to consult with a Board Certified Immigration attorney by telephone.