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 stratigraphy (JAM level), you should refer book by "Ravindra Kumar". For deeper knowledge you can also read the stratigraphy book by "K S Valdiya".
Sir, K.S.Valdiya's "The Making Of India"?