Hello

If you were supposed to give boards this year but you couldnt because of the corona virus and the lockdown, it is understandable as some students could not manage to give their boards due to risks as well as because they were infected and they couldnt physically give the exam.

In your situation- it is possible to give the exam next year but first you will have to register yourself for the 10th board exams, for this you will have to contact your school administration and ask them to enroll you for the board exams taking place in the year 2021. All the best!