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)
Prashant kumar
In either exam not more problems came from ac application of diode and also ac application not mentioned in syllabus. but you can study these topics since these are not very big. Application of Zener diode is important for both exam purpose mostly for JAM.