In case of educational documents, State Governments have now opened Regional Authentication Centers (RACs) at various States from where the document should first be attested. Documents attested by these authorities then need to be presented to MEA, After Ministry of External Affairs seal is given, we can Submit to Concerned Embassies.
In Tamil Nādu we have to Submit the certificates to the Secretariat in Chennai, you will have a go to Dept of Public (Foreigners), and also have to visit the concern university to do the verification, We have office in Chennai and offer assistance in home department attestation.