At this point in time, NTA did announce that JEE Main exam for April session has been postponed and it might be conducted during the last week of May. We do not have any definite dates as yet. So you might have to wait for any official notification from NTA, This means you do have to prepare for JEE Mains and Advanced as well. You can prepare from our online NEET preparatory courses available at: https://learn.careers360.com/engineering/jee-main/