For most of the boards, if the student have failed in the examination then one can reappear for compartment examinations. Although in this Covid scenario the marks are awarded to the students on the basis of internals and previous records. Thus in order to give the student some extra chances, some of the boards have availed the facility to sit for examination when the situation of the covid will be better.

Thus I would recommend you to visit the official website of your board and see if there are circulars or not. If you don't find then you can call the official helpline number present on your boards website and get it discussed.

I hope this answer helps. All the very best for your future endeavors!