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)
Amol ashok pawar
https://m.youtube.com/playlist?list=PLYXnZUqtB3K98cc6mBL5zQngXa2_8bUYd this is a playlist for spectroscopy you can also watch gate chemistry channel for physical spectroscopy concept.