I am an Indian citizen and have been working with the World Bank, Washington DC on G4 Status for the last four years. I have now been accepted for a Phd course by umich, so I will have to change my status to F1.
I intend travelling to India and applying for an F1 Visa there. Do I need to show any document proving my G4 status in the last four years, or my employment with the World Bank ?

I had an SS number. Will it remain valid ?

I have a driving license showing my DC address. Can I simply apply in Michigan for a change of address or will I have to apply anew for a Driving License ?

Thanks.