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MEHAR_MAH said:
When I need to send Reference letter ? After initial assessment or before it ?

You have send Ref letter with your complete application to your local VISA office, no need to send them to NS
 
Singhsaab thanks for reply.

What I understand is that initially I only need to send application form, and all other documents (education cert, ref letter etc + Application forms) will be sent to local Visa office after initial assessment passed.