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)
Priyanshu kumar
https://youtu.be/ouwYMGXSjpA check this
Just for knowledge purpose you keep in mind...
This video helps you to learn the radioactive series in tricky way