Will there be increase in opportunity for getting student visa and green card for indians after COVID-19 ends??

There likely will not be a correlation between Covid and student visas.

How do I file for my wife who is living in the USA after her visa expire

Assuming you are a USC, she may adjust status through good faith marriage to you. Best to consult with an attorney to learn more.

No this would not impact your naturalization application.

Immigration required evidence

You should provide information re: all of your children and stepchildren in this section.

Best to have an attorney review the denial decision before taking any action.

Best to have an attorney review the denial notice before taking further action.

I agree with my colleague - the I130 version you are using is likely outdated.

Can a B1/B2 visa stay for another 180 days after 6 months?Do I have to apply for extension to get that 180 days or no?

Yes you may apply for an extension given Coronavirus, prior to the I94 expiry. Consider consult or guidance from an experienced attorney for...

Adjustment of status?

You may be eligible for adjustment of status through a good faith marriage to a USC and proof of valid entry. Best to consult with an attorney for...

What is the process to petition for my mother?

Consular processing with the filing of Form I130 and supporting docs and fees with her new divorced name.