You may find the rates for internation shipping by speed post here:
http://www.indiapost.gov.in/SP_Int.aspx
Its a calculator.
Speed post - rs. 425 for .25 kg, rs 100 for each additional .25 kg + service tax (14% now (2015))
SAL - rs 310 for .25 kg, rs. 65 for each additional .25 kg
Registered parcel - ?? don;t know