Hii aspirants

let me clear your doubt.

For kcet preparation first of all go for basic book that is ncert book for physics, chemistry and math

And here I am providing you link from where you can download book for kcet preparation

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/download/kcet-ebooks&ved=2ahUKEwi9o_LC47TaAhUKPI8KHTt2BCkQFjABegQICRAB&usg=AOvVaw02kYqyn-J1XqzXtG4WoH1A

you can also solve previous year question paper for knowing the level of questions and here I am providing you link for the same

https://www.google.co.in/amp/s/engineering.careers360.com/articles/kcet-sample-papers%3famp

I hope my answer will be helpful for you

Good luck