Rakhee, now with the lockdown being extended until May 17th, it is highly unlikel that JEE Mains will be held before that. It ight be postponed until June because factors like spread and control of the viirus needs to be checked. And also now that it has been proven that this pandemic also can be spread through community transmission, it takes time to conduct any entrance examination. So these exams might happen only after May. However this is a speculation and you need to wait to hear from NTA regarding any official information.