Consult with an attorney for interview preparation assistance.

File the I751 as soon as possible. Consult with an attorney for guidance.

Best to work with an attorney to file the I751 at this stage.

No that alone does not grant work authorization.

They can depart within their authorized stay.

Your case is too complex for a simple answer. Consult with an attorney for guidance.

Contact the relevant licensure board for requirements and eligibility.

Best to consult with an attorney to discuss your inquiry further.

Yes they may apply for citizenship under the 3 year rule.

Timing varies but generally 6-8 weeks.