HI I am currently studying in 12h I want to write KCET and JEE mains in 2020, which books should I prefer to get a good rank in kcet and jee

Hello Yash
As there are a number of books available and some of the good books are :
Mathematics -

• NCERT
• Rd Sharma
• A das Gupta
• Arihant ( Amit m Aggarwal )
• Cengage learning ( only question )
• Previous year book

Chemistry -

• NCERT
• Op tendon
• JD Lee
• P Bahadur ( read only relevant topics )
• Rc Mukherjee
• Cengage learning ( only relevant topics )
• Chauhan ( organic chemistry )

Physics -

• NCERT
• HC Verma
• Mishra
• Cengage learning
• Previous year ( 36 years )
• IE ERODOVE

Important thing do not follow all the books at a time first grasp one book and practice it then move to other . And first of all strong your concept and read NCERT .
And you should solve questions banks and packages of any one good institute ( bansal; fitjee; vibrant ; vmc etc.) And must join test series to analyse yourself and yoyr progress.
Good luck

Hello Yash, If you are planning to prepare only for JEE Mains, then you should solve books like Arihant Publication, Cengage learning Publication. But if you wish to prepare for JEE advance, I would suggest you try out FIITJEE Institute booklets because they have some of the best questions and complex question which will strengthen your concept.