Employment Based Greencard

I am August 2018 filer and was waiting for EAD to come, but unfortunately received a RFE letter today after 5months to submit additional evidences related to Birth certificate. My birth was not registered and hence I didn't had birth certificate. As per attorney guidance, submitted 2 affidavits and non-availability letter signed by local registrar office in plain letter since there is no standard format for non-availability birth certificate at the time of filing on Aug 2018.

RFE says:

1.Submiited affidavits are not enough. Secondary evidence should be but not limited to church or school records indicating name/parent name, DOB or hospital records or govt issued document.

2.where BC record doesn't exists, applicant must submit an original written statement on government letter head indicates reason for the birth not registered, whether similar records for the time and place available with legible stamp, seal, signature contains words like birth or death, secretary etc.

I am so worried after so many years of wait and need help for this forum to answer this RFE:

1. can I provide SSLC (10 school ) transfer certificate as a secondary evidence? Is there any other proof can be treated as a valid proof for secondary evidence?

2. For Non- availability birth certificate - Is there a standard format available where I get the signature from local office and submit? I searched in many forum, but couldn't find a standard format for NABC.

Do I need submit original document or submit just photo copy and bring originals at the time of interview?

Did anyone had similar experience and able to clear the RFE by providing necessary documents?

Appreciate your inputs and thanks in advance.