Listen whatever you have a document ok your education or nikkah nama from even nadra and every single document like passport police character certificate etc you should go to the foreign affairs office for attestation which is the shahrahe faisal near close to sindhi muslim society go and attest there also this is what I did into my application. . Second you don't need to worry about your Urdu nikkah nama stamp cuz ( Molvi Sahab) have a stamp that's worth that's why you got the affidavit otherwise you can't get the affidavit even your nadra marriage certicate clear..
First of all, no education document you need to submit. It will be a unnecessary document .
Secondly none of the document need foreign affair stamp.
Thirdly lets clear what specifically they say in checklist for pakistani origin marriage:
1-Your urdu nikkah nama must have registrar stamp , then it has to be translated in english by a certified translator , a certified translator will maximum do a notory public on his translated document.
2- Nadra issued marriage certificate copy.
Please do not exhaust yourself for extra stamps only carefully read and follow checklist. It any part says notory or authentication then do so...