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)
Abhijeet Gaurav
Yeah you should cover. There can be questions relating to it. Though it's not very frequent. I would suggest you that you should cover these not so very important topic during last time of your syllabus completion. May be during last Dec or early Jan if you have time left for it. Otherwise if you don't have time then you can probably skip these topics even. It's totally based on have you covered more important topics already. You should judge on that basis.