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)
Abhishek singh
Actually this is some higher level concept called Green's Theorem. But as of now, a B.Sc. student is not supposed to know this concept (you will learn this in M.Sc.), But there are some tricks to solve this type of questions, thay give correct answer in case of a cube. here it is.
thank you sir