Hello,

According to me there is No book which is better than NCERT for class 12. NCERT Books cannot be replaced.NCERT Books keywords which maybe directly inducted into the case study questions of board exam. Most of the Topics are explained precisely  in NCERT.

After you are done with NCERT you can go for reference books like Poonam Gandhi & Sandeep Garg as they are good for practising case studies.

Hope this was helpful.