Hello aspirant,

Hope you are doing well

Best book to crack IIT Jam in Mathematics Statics are :-

• Complete Resource Manual M.Sc Mathematics by Suraj Singh
• An Introduction to Probability and Statistics by V.K Rohatgi
• Fundamental of Mathematical Statistics by S.C Gupta and V.K Kapoor
• Introduction to Mathematical Statistics by Robert V. Hogg and Craig McKean Hogg
• Vector Calculus by Murray R. Spiegel, A.R Vasishtha
• An Introduction to the theory of Statistics by Mod and Graybill
• Calculus by Thomas and Finny

For more information, Here is the link :-

https://university.careers360.com/articles/jam-syllabus

I hope this information will help you.

Feel free to ask any query.

All the best