Please contact an immigration attorney to help you with this because it will take time to get it thru FOIA. And if your test is soon time is not in your side. Good luck
You will need to file multiple requests under the Freedom of Information Act. Consult with an attorney if you do not know how to do that.
US CIS wouldn't have your court records.
Stop using the telephone, file a WRITTEN request for your file with EVERY AGENCY:
- CIS
- EOIR
- CBP
You might be wise to have an attorney help you ... especially since this should have come up when you got your greencard 30 years ago.