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)
Dhairya sharma
you should go with previous year questions paper. It'll develop your confidence and solving aptitude. And for betterment you have to look for mock test.
hope you get it!