Hi there, Yes it is possible to give JEE Main again in 2023 even after your last attempt being 2022 but for appearing in JEE Main 2023 first you have to give your 12th again from NIOS board as to do 12th from NIOS board you only need to complete your 10th through which you can do your 12th from NIOS board which you can use for your JEE Main 2023 attempt. But as you said you have done your 12th in 2020 it means that you have done your 10th in 2018 so you must need a gap certificate ready in case anyone ask about your gap from 2018 to 2022. Hope this might help you.

Unfortunately, there is no such provision which will allow you to re-appear for JEE Main again after passing out from National Institute of Open Schooling. A student can only give JEE Main examination a total of 3 time in his/her lifetime, and once that is exhausted, no separate attempt will be allowed even if she/he has qualified board exams for a second time.

All the best!