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请教8老师, I am applying for naturalization for my mom, who is a senior (73 yrs old),有老年痴呆. She has lived in the US as a permanent resident for more than 5 years. Her doctor already signed the N648 form (Medical Certification for Disability Exceptions)-waiver for the English and civics test. The doctor checked the box "applicant is unable to understand oath" in the 648 form.

1. to waive the oath requirement, USCIS will require a designated representative, is it correct ?

-Correct in your mom's case.

2. should i submit the proof for the designated representative at the beginning when we file it online (when we submit N400, N648 )?

-Yes, of course. It will make the process faster if you (as your mother's representative) submit the written request for oath waiver (provide all the documents)  with the N-400 filing. In addtion to the completed N-648 signed by the doctor, you still need a written statement from the doctor to explain how the condition prevents your mother to understand the oath.

3. or we do not have to submit proof of the designated representative at the beginning when we file it, and we can upload and submit it when USCIS issue RFE request for more evidence? if so, when USCIS issues RFE, will it cause a long delay?

-Yes, it will delay the process.

and when the evidence is submitted upon the request, the case will be re-queued for review (start all over again)? and will be reviewed by a different officer? 

4. What is the evidence/proof USCIS requires for a designated representative? (family member)

-You need to provide your birth certificate to prove your blood relationship with your mother, and also provde the copy of your naturalization certificate or your US passport. You also need to provide your written statement (Affidavit) to confirm you have primary responsibility and personal knowledge of your mother.