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)
		
			
			
			
			
			
			
			
			
			
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Alka gupta
it is depands ....what do you want to find. for an example....if you want to find Eigen values of a matrix then after row/ columns transformation it will change...but if we want to find determinant then according to determinant property after applying row/ column transformation det(A) never change...