If your partner is a ISC they can petition for their mother.

Agree with my colleagues and add that after you file in US and fingerprints are captured either from before or after applying you can leave and...

You can file same time and should. It will take several years.

It is done either during registration after interview is scheduled or at interview. You have several months to wait.

This is not an Immigration question - contact social security administration.

Yes if you find a family or employment based sponsor.

If you have nothing problematic in your past you should be fine and receive a swearing in eventually

No requirement for education - they have done away with I-944 form.

Yes - they are separate cases. Be sure to submit fees, civil documents and financial documents for your mother and to keep in contact with NVC once...

You should consult off line with competent Immigration Counsel as soon as posable. This is a general forum where the attorneys are not supposed to...