@ Prabha. It's better if you take a new book because your book is 2 attempts old. Pankaj Garg is a good book, It is not suggested to change the book. Please tell me the reason why you want to change the book. Please tell me about your marks obtained in the previous 2 attempts. Then, we can discuss further.
But, you must refer PM + last 3 attempts RTPs also thoroughly with 3-4 revisions.