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)
Ujjawal vishal
to understand pattern and nature of exam refer previous year papers... see following link https://youtu.be/BOqGHiRtN4g