As a part of extra books Rd sharma is one big name
So there are many reasons for not recommeding this books few of them are listed below
1: On the very first impression you will get to know that this is very thick book and it should be divided in two or more parts . You cannot carry it easily in school . You have to carry extra bag or something for that . You cannot carry it with your school bag
2: There are lots of mistakes in this book . If you totally rely on this book then you might learn something wrong . There are many mistakes in this book
3: It contains many questions of same type
. I mean you will get bored to solve the same kind of questions .
4: It is very expensive also I mean extra book that cost 500-600 with many negative things . I mean many of us cannot afford it
So I would recommend you all to rely on previous year papers and other sample papers then to waste time on this book