Hi,

In Order to prepare for any PCM based Exam, first you have to study the basic books of Physics, chemistry and Mathematics. The basic book is NCERT. First, go through the NCERT, solve it's problem then go for some higher level books like HC Verma for Physics and others. Since you have studied for NEET also , the best thing to prepare for KVPY is also to solve previous years question.

I hope this will answer your query.

Thanks!!!!