We do not know the source of your information because there is no official update that NTA mentioned that NEET will be conducted twice in 2021. While this has been doing the rounds for couple of years now, it never really happened and so we cannot validate anything about NEET 2021 being conducted twice. For now NEET 2020 has been scheduled for September and NTA's priority will be to complete NEET 2020 maintaining the social distancing and sanitisation rules. We do not have any official information regarding NEET 2021 being conducted twice and so at this point in time. this is all speculative. But if you did come across any source of information that NEET 2021 will be held twice, if you can share it with us, we shall verify the source and check its authenticity for you.