Hello aspirant

hope you are doing well and safe. With reference to your query,  I would  like to say that your query is little confusing to intrepret , I would say that you have to give supplementary exams of those subjects only in which you have failed ,and yes you can re-exam for them but you have to apply on cbse portal. After passing those subjects only ,you will be considered pass

Hope you found this answer informative. Best wishes for your future