What documents are to be carried for passport renewal?
If your address is same as your previous passport you don't need anything.. With the same particulars you will be reissued a New passport with Different Number and all you need to bring is your original passport and one set xerox. However if the address is different you will need one address proof (aadhar card, voter id anything). If you already hold an ECNR passport no need to submit your matriculation certificate but if you have ECR passport you need to procure your original certificate. Nothing else is required.