Hello,
For Maths completing NCERT Textbook is must. For references go for either of the following.

1. R.S Agrawal

2 .Together With

3. NCERT Exemplar

4.SL.loney

These are enough for your cbse 12th board exam preparations.
Good luck.

Expect RD Sharma, you can study - NCERT, RS AGARWAL, McGrawil etc..

Mostly you should practice all the practice papers & mock tests..

Good luck!

Must do ncert also go for some good coaching materials by borrowing it with your friend they will help you a lot.

You can consider below names -

• 
  Higher Algebra by Hall and Knight for Algebra
• Coordinate Geometry by S.L. Loney
• Differential and Integral Calculus by N. Piskunov
• Calculus and Analytic Geometry by Thomas and Finney for Calculus
• IIT Mathematics by M.L. Khanna
• Course in Mathematics for IIT-JEE by Tata McGraw Hill publications
• Problems Plus in IIT Mathematics by A Das Gupta
• Trigonometry by S L Loney

Good Luck!!!