I do not know if there are any statistics on that, or whether it is even possible to have statistics on this question.

It would not hurt to send the prenuptial agreement. You will have to provide whatever evidence you can get that you live at the same location as...

If that is her actual birth certificate, then yes, USCIS will accept it. Yes, you will have to show it is the same person as the one on her passport.

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If your visa is available and you are in status, then yes, you can file for adjustment of status in the U.S. and you should do that.

If one of your children is over 21 and is a U.S. citizen, have your child file an I-130 for you and you can then file an I-485 and an application...

Perhaps you qualify for asylum. Or perhaps there will be an extension of parole. Perhaps you have a relative or spouse who can file a petition...

If you are filing at the same time as your spouse or child is filing for adjustment, mark yes. if not, mark no.

Yes, you should indicate every university you attended, even if you did not graduate and even if you dropped out because of a war.

Divorce does not disqualify a person for an h1b visa so no, there is nothing you can do to get your spouse's H1b visa revoked.

You will have to ask USCIS why their programs are not working, a lawyer cannot answer those questions.