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)
Vishal kumar
there is a very good book published by Made Easy. You can consult that for solving more and more mcqs. I have personally used it and it is a very good resource for paper 2.