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)
Mahak
don't do these in 3 dimensions as it's very complex to draw it's being learned at phd level or at msc level where we specifically opt solid as subject and for jam it's not required