Even if you are just aiming for selection, RD Sharma books become a must.
- RD Sharma Class 11th and 12th
If you are aiming for a rank around 1000, you need to be better and just RD Sharma won't suffice.
- ML Khanna IIT Mathematics might be good for you although its a bit more rigorous so be wise while selecting its problems
If you aim for nothing less than a 2 digit rank, then you must put in some real good effort and buy all of the below books to get a deep idea of concepts involved:
- Coordinate Geometry by SK Goyal
- Arihant Differential Calculus
- Arihant Integral Calculus
- Arihant Algebra
- Arihant Vectors and 3D Geometry
- Arihant Trigonometry
- TMH Mathematics