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)
Ruby negi
griffths is the best book but the language is tough, so you can buy grifths, arthur biser . if you read these two, u definitely do all problems in qm..these books are enough for jam,csir....one more thing, the vector algebra (1st chapter of grifths of EMT) must read this chapter from Griffiths of EMT...