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)
Satpal singh
https://www.quora.com/Can-the-integral-int-x-x-dx-be-evaluated-Special-functions-can-be-used-if-this-integral-cant-be-evaluated-with-simple-functions-e-g-Gamma-function-%CE%93-x-or-Lambert-W-function-W-x see this whole link
there are so many approaches given in the link
please see all the approaches
sure Satpal sir.