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)
Ashutosh singh
But, yes...do not over-read it, stick to your syllabus. Otherwise, you'll end up confusing yourself.