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)
Achyut ranjan gogoi
u will get detailed information in clayden about this or u can refer Carey Sundberg also. I will encourage u to read books rather than internet.