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)
Alka gupta
eduncle study meterial also have topic wise qus and theory... and if u want more qus for practice then "samvedna publication " books these books are topic wise with lots of qus for practice