IGST rate change on imports for petroleum operations and coal bed methane updates the tariff entry, altering tax application. Amends the customs exemption notification to substitute the IGST rate entry in the Table for the specified serial number, altering the tax rate on imports of goods used in petroleum operations or coal bed methane; enacted under section 25 of the Customs Act, 1962 and section 3(12) of the Customs Tariff Act, 1975, with the amendment's commencement date specified and references to the principal notification and its last amendment.