I have practised many books of mathematics in which one of them was r d sharma when I got a chance and time to solve that book I tried many problems most of them was from ncert mathematics so I have to do all the problems again again from ncert also and from r d sharma also my coach told me that it was nice book I told him that one of the questions in that book were similar to questions in ncert
So I reccommend u not to buy this book and not to waste ur money as it is costly too