Hi Ritik,

I think you have not asked your full question as you have asked about class 12th private form but from which school from NIOS or any other school.

The registration or application form of NIOS Block 2 for class 12th has stared on September 16, 2020, last date is January 31, 2021 without any late fee.

Refer here for more info - https://school.careers360.com/articles/nios-registration#NIOS-Registration-2021--Important-dates

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!