Mathematics is a subject, which requires a thorough understanding of concepts, theorems, and formulas before starting off with solving problems. Below is a compiled list of all the important Math books recommended by IIT toppers useful for both JEE Main and JEE Advanced examination point of view.
Best Mathematics Books for IIT JEE
S. No. Books Authors
1. Mathematics class XI Vol. I
Mathematics class XII Vol. I R. D. Sharma
2. IIT JEE Mathematics M.L. Khanna and J.N. Sharma
3. New pattern IIT JEE Mathematics S.K. Goyal
4. Integral Calculus for IIT JEE             Amit M Agarwal

thankyou,

• R D Sharma (Vol I&II).  [Objective mathematics]
• A Das Gupta
• Integral calculus by Amit m Aggarwal
• Differential calculus by Amit m Aggarwal
• Coordinate geometry by S k Goyal
• Algebra by S K Goyal
• Vectors 3D by S K Goyal
• Trigonometry by Amit m Aggarwal
• NCERT