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)
Jeevesh magnani
Yes, such questions are asked in JAM and JEST. If you aren't able to understand the solution from one source, I must suggest two things: 1. make sure basics are really clear. 2. see standard books for explanation. once above two are satisfied twry working out yourself make mistakes, and see where you made mistake, and how to rectify.