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)
Dhairya sharma
doubtnut.com/question-answer-physics/two-tuning-forks-when-sounded-together-produce-3-beats-per-second-on-loading-one-of-them-with-a-litt-17464985
it's a doughtnut video it'll help you
for further query u may ask