I would suggest you to go through well with NCERT books as it will be very helpful to crack the exam. Here are some of the books name you can prefer for KVPY preparation.
Physics:
Fundamentals of Physics  By- David Halliday, Robert Resnick, Jearl Walker; Publisher: Wiley
Concept of Physics By- DC Pandey
Chemistry:
Moderns ABC of Chemistry for Class  XI With CD By- Modern Publishers
NCERT Physical & Organic Chemistry By- OP Tandan
Mathematics:
Mathematics For Class XI By- R. D. Sharma; Publisher: Dhanpat
Biology:
Elementary Biology (Volume - 1)By- K.N. Bhatia, M.P. Tyagi; Publisher: Trueman
Good Luck!