IIT-JAM(JOINT ADMISSION TEST for M.Sc) ,IIT conduct IIT-JAM once in a year in month of  Jan.-Feb. 

Eligibility : for mathematics(MA) - BSc  with atleast one subject as mathematics in related discipline 

AGE : there is no bar on age

 

 JAM 2018 official link  : http://jam.iitb.ac.in/