What is the procedure to get admission in IIT for M.Sc Mathematics? Will my graduation score affect the admission?

All the IITs and IISc Bangalore jointly conduct an entrance exam, namely IIT-JAM (I.e. Joint Admission Test for M.Sc.) for admission in M.Sc. courses in these institutions. The educational qualification required for the entrance exam, is B.Sc. or equivalent in relevant discipline with following