I understand that the Deputy's query relates to an application for citizenship. A letter from the applicant's General Practitioner showing the applicant's name, address and dates of attendance can be used as proof of residency. A letter from an educational institution can only be used if the applicant is still attending the educational institute, and must include the student's name, address and dates of attendance.
A list of documents that can be used as proof of residency can be found on the Citizenship website at https://www.irishimmigration.ie/wp-content/uploads/2020/12/Proofs-of-residence.pdf
Queries in relation to the status of individual immigration cases may be made directly to my Department by e-mail using the Oireachtas Mail facility which has been specifically established for this purpose. This service enables up to date information on such cases to be obtained without the need to seek information by way of the Parliamentary Question process. The Deputy may consider using the e-mail service except in the cases where the response is, in the Deputy's view, inadequate or too long awaited.