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
You have to cover alot of portions dealing with atmospheric sciences apart from the geology topics you have read till MSC.... The main focus is on the climatology part (most probably in third section).