I got 96 in maths by not even touching RD sharma
First of all .. the basic requirement for class XII maths is NCERT you should be thorogh with each and every concept of NCERT and you must practise each and every example and exercise question of NCERT .
After your NCERT is completed use EXEMPLARY (NCERT} to practise question which will act like oilling for your mind . And after that use RS aggarwal or RD sharma or Gupta Bansal .
If you are from my category of students who dont even likes to see RD sharma i would preffer Gupta bansal but just stick to one going on miltiple will give you nothing .
At the end dont just forget to practise previous year papers of CBSE {or your respective board} roughly 40℅ question are copy paste from previous papers and the rest covers the concept that is used in previous years