Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Deb dulal halder Halder
johnson Dictionary is also significant. get some information about it. not necessarily have to read it. some preliminary information will do