hello simran

thanks for your query.

you being in class 11th, i would suggest you to solve the questions of NCERT only. solving NCERT will not only help you take hold class 11 exams but will also help you further in your competitive exams. still if you want to take help of any other book i would suggest you to take books with unsolved answers as that way you would put more of your personal efforts in solving a particular question. RD Sharma for maths is also a good option while choosing out of course books.

thank you 

The best book which should be done thoroughly is your NCERT textbook. Your NCERT text book will not only help you in your 11th exams but also come in handy for your JEE mains, if your are appearing for it. Ensure that you make a schedule for your maths and work on it every day for atleast 2 hours. Complete each and every exercise and also solved examples, without leaving anything at all. Closer to your exams, try to solve as many previous years papers as possible. In fact for every other subject too ensure you are thorough with your NCERT books. It will help you to score well.