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)
Ravi bhushan
https://youtu.be/HF7s3qJh5zg https://youtu.be/E_9emRckIzQ You can see these videos for Electronics and Electrodynamics.