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
For Physics portion NCERT 11th & 12th questions after every chapter & in between exercises are enough. But if you want you can solve IIT JEE Mains level question too. Don't solve all but those which have easy-moderate level of difficulty. Don't go for hard level of difficulty ones. This much Will help & Will be enough