Hii!
There are a lot of competitive exams in India for almost every aspect of career, be it for medical, engineering, research, agriculture, fashion, or any government job etc.,
So, you need to mention the specific field you are interested in, for us to list down some books for you on that field according. Kindly restructure your question and ask again mentioning the name of the exam you are interested in and the other necessary information.
Hope you understand.
Good luck!