Is H1-B guaranteed when cap-exempt employers file for it? (if the application was filed properly and cleared all requirements)

There is not lottery and therefore no selection if the employer is cap exempt. That is the whole point of being cap exempt.

Immigration visa

It is not a lifetime ban, more likely 15 years. As to an appeal or refiling, that depends on what has happened to this point and what the denial...

Can my spouse start working on receive of receipt from USCIS? or Is she need to wait till it get approved by USCIS?

Your spouse must have the EAD in order to work. Is there a reason your current attorney could not answer this basic question?

My question is how do I get out of being his sponsor? Can I file another form or write to the court anything?

If you are referring to the I-864 affidavit of support, you cannot "get out of it" but then again it does not make you liable for anything really...

How does the OPT period works?

This is why F-1 students should apply for OPT 90 days before graduation and not wait for the last minute. The date is impossible to predict but...

LCA posting from different employers at same job location possible?

This is remarkable. You have at least one, if not two, immigration lawyers working for you and you decide it is better to ask strangers on a blog,...

My wife wants to start the process of getting me a permanent residents.

You really need to speak to a board certified immigration attorney who can help with your waiver, not pardongccnn

Can I apply for US Citizen after 3 years of being a VAWA GC, is uscis review again green card application to get citizenship?

You must wait for five years. And you need very a very good, Board certified immigration attorney to assist you since CIS will definitely...

How can I file

A U may work but ask the police if they will support that visa first. Also, as the school terminated your SEVIS registration and if so which school...

Yes, it is possible but we need to look a the reasons why you would want to change to a J-1 in view of the two year foreign residency which may...