2. My advise is that you see at least couple of legal counselors, including non-profits, and seek their advice.
3. I don't know whether the interview date is already set or not, but I think there is no point in attending the interview if you are under probation at the time of interview. Your options, I think is to postpone interview (but it is unlikely that the USCIS will delay the interview over a year) or withdraw your petition for time being and reapply as a new applicant once your probation is over.
Good luck.
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