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)
Mahak
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.dacollege.org/smat/physics-sem2-Acoustics.pdf&ved=2ahUKEwjm2fn6k6nrAhXVXisKHdTAC8MQFjABegQIDBAG&usg=AOvVaw08zNMxUKg3993T0wfCa3Vh&cshid=1597905019153 watch it