Hii..

Yes you can prepare for JEE and kcet both at the same time first of all for that you have to know about the syllabus of both this examination go through the syllables .

The syllabus of this is a both entrance exam are almost same so you can the prepared these two and the same time before focused and determined during your preparation work hard solve previous year questions paper and practice a lot.. have some good books with you and go deeply with those book ,clear your Basic concept....

All the best!!