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)
Kanika goswami 1
Question is based on riemann integreble and if you know the theorem result then it is very simple question. But as your query I have solved it completely by the result that you must keep in mind. Check attachment.