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)
Ruby negi
Samvedna publication books for JAM ( have lot of objective type questions and previous year TIFR NBHM questions also ) ( there are many mistakes in answer key and solution of samvedna books. Ignore them)..good luck dear.