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)
Nirmal
sabia, in net they don't ask you to find tangent inverse of any angle besides some most popular angle (0,90,45,30,60 deg.) so don't worry . If they ask to do so at any questions you simply pass by the question. I don't think they ask such a silly type of questions.