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)
Saurabh 1
For jam you don't need to read Kepler's law in details.. Just go through the basics of three laws that govern planetary motions and formulas used to represent them mathematically. Apart from that do read about various planets and their number of moons, density and rotation sense.