Hey,
M.Sc in National Institute of Technology,Tiruchirapalli will be through marks scored in JAM that is Joint Admission Test.JAM is the entrance test conducted for admission into M.Sc and other post graduate programmes in IITs,NITs,IISC,IISERs and other top institutes. The basic eligibility criteria is to have a relevant Bachelor's degree with atleast 55% aggregate in Bachelors and for SC/ST it is  50%.For Physics you must have studied Physics for atleast two years and Mathematics for atleast one year during the course of graduation.The application form was released from 5th September 2018 to 10th October 2018.The exam held at 10 February 2019 this year and result will be out by March 20, 2019.Admission is through centralised counselling for M.Sc to NITs.
For information regarding the preparation of JAM Physics do follow the link given below:
https://university.careers360.com/articles/how-prepare-jam-physics/amp
Hope this helps.
Good luck.

NIT Trichy

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