It is true that JEE Mains, JEE Advanced and even NEET have been postponed. The MHRD has come up with a new schedule for JEE Mains, JEE Advanced and NEET 2020. JEE Main examination will be held between 1st-6th Sept, JEE advanced exam will be held on 27th Sept & NEET examination will be held on 13th Sept. At this point in time, this is the information we have. Now JEE Mains is a National level exam and is conducted by NTA. But KCET exam is conducted at State level and so it comes under the jurisdiction of the KEA. So you have to wait to hear from your State authorities.