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 Best Answer
For Biology portion - MCQ for Life Sciences by Pathfinder For Maths - RS Aggrawal with it's solved exampled and basic level. Don't rush to much higher level. For Chemistry - Some Youtube videos + NCERT 11 & 12 For Physics - NCERT 11 & 12 If you have time Please go through GATE-BT questions for Maths & Biology question especially NAT portion. As there would be direct questions from the area. GATE-XL for Chemistry portion.