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)
Suresh khokhar
https://www.brainkart.com/article/Cyclic-processes-and-PV-diagram-for-a-cyclic-process_36256/ this article give u best explanation