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)
Rahul kumar
For IIT-JAM, you only need to focus on different formations from Archaean to Recent. I would suggest you to make a list of different formations from Archaean to Recent in tabular form. Ravindra Kumar's stratigraphy book is more than sufficient for this purpose. There are few important supergroups/groups which you need to study in detail and are very common like Gondwana, Siwalik, Vindhyan, Cuddapah etc.