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)
Mahak
no need of doing hc verma it's important to do Griffiths and garg Bansal ghosh as these two books are also helpful in msc level as well as if you appear for any written exam in any of research centre