NTA has released the provisional answer keys for the exams conducted by NTA in Phase I of UGC-NET December 2020 and June 2021 between 20th November 2021 and 05th December 2021, Phase II between 24th December to 27th December 2021, and Phase III on 04th and 05th January 2022.
The dates for checking of Question Paper (Answer key) and challenging of Provisional Answer Key through NTA website (https://ugcnet.nta.nic.in) is from 21st January 2022 to 24th January 2022 (09:00 PM).
The UGC NET JRF 2021 Exams were held on the following dates: 20, 21, 22, 24, 25, 26, 29, 30 November 2021, 01, 03, 04, 05, 24, 26, 27, 29, 30 December 2021, and 4 & 5 January 2022. The exam dates were announced via a notification released by the NTA on 22nd October 2021 on the official website of the UGC NET.
The UGC NET 2020 scheduled in the month of December was supposed to be conducted in May 2021. However, due to the second wave, it is now merged with the June 2021 cycle.
source: https://www.anujjindal.in/ugc-net-result-e-certificate-answer-key/