Composite and mixed supply explain me ???

Composition scheme is under seperate registration.
Mixed supply as the term denotes it's a mixed supply of goods and services.

Composite and composition have two different scenarios in GST.
composite supply: supply consisting of two or more taxable supplies of goods or services which are naturally bundled. tax rate would be the GST rate of principle supply.
mixed supply: when two or more taxable supplies are supplied under single package which are not naturally bundled. tax rate is highest tax rate among those supplies will be applicable. Ex: gift box containing sweets(5%), dry fruits(12%) and chocolates (28%)supplied then highest rate i.e. 28% will be attracted based on type of chocolate.

@ Thank you Soo much  n sowmiya

Composite supply : in case of principle supply exempt, and bundled two or more taxable supplies..