Here is a list of books which provide excellent text and reference for class eleventh (10 or X) CBSE board.
NCERT BOOKS: These books are mandatory and like bread and butter for the CBSE Board. They contain the necessary board syllabus, please find below a compiled list and links to rent them or purchase them used, secondhand or new at best discounts.
MRP 375; Starts Rs as low as Rs 282 with more than 25% discount almost on the cost
MRP 90; Starts Rs as low as Rs 65 with more than 28% discount almost on the cost