How often for Indians does COE get rejected for Japan and is GPF considered as Proof of funds for COE application ?
please go through the VISA guideline and check for the eligibility. The main part is interview and document provided is correct. For document list, please visit the webpage of the organization. You will get all the details or visit nearby embassy for that.
Rejection reason can be anything and can only be known when a person goes through it. Interview is tough and yet tricky. Ask any experienced person who have visited the organization for VISA.
Hope it helps!