Exempted Supplies under GST means supplies which attract Nil or Zero rate under GST for the supply of goods or services or both. It also includes non-taxable supplies under GST. Refer to Notification No.2/2017-Central Tax (Rate) for the list of exempted goods.
As per Notification No. 11/2017-Central Tax (Rate), Central Tax is to be levied at Nil rate for Support services to agriculture, hunting, forestry, fishing, mining and utilities which are falling under HSN / SAC 9986. For details of services falling under 9986 refer to https://indiagstdotin.wordpress.com/2017/07/28/support-services-to-agriculture-hunting-forestry-fishing-mining-and-utilities/