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)
Chandra prakash
https://courses.lumenlearning.com/suny-osuniversityphysics/chapter/15-6-forced-oscillations/ red this
plz read this article