Hello,

For IIT JAM, these books will help you a lot.

1. Mathematical Analysis
By Malik and Arora
Rs. 499
2. A complete resource manual MSc Entrance exam
By Suraj Singh and Rashmi Gupta
Rs. 699
3. Arihant paper solutions
Rs. 215
** It has too many errors but will give an idea about the types of questions in the exam.
4. For great problems from double & triple integrals, Area, Volume, Differential equations plz refer APPLIED MATHEMATICS of second semester of Engineering by GV KUMBHOJKAR.
Rs. 450
5. Take online mock tests of any coaching institute, VPM classes provides 12 mock tests in the september for just around Rs. 1500-2000.
This will remove your exam fear and you can check your level.
I am not telling you to try,
Just go with it and see.
I am sure you can make it.
Good luck.