Hi Syed Abu.

The syllaus for both JEE and KCET is same - 11th and 12th. So, for clearing these exams, you have to be thorough with the important topics in PCM. For that, you can refer different books or there are some apps in play store, some of which are paid, that can be of real help. These apps will include the study materials, questions, mock tests etc. in one place. There will be good free apps but premium apps are usualy better than free ones. So, go for one of these. And, in either way, work hard and smart.

Good Luck.