Because of the coronavirus pandemic this is a very unusual year. Universities will be seeing a lot of cases of students who have had their final exams cancelled. The most obvious reaction is that this is not your fault and was entirely outside of your control.
I would ask the university. However, I would not be too concerned. Be sure to remain calm and respectful whenever you are dealing with the university. I think that it is okay to say “I am concerned because the CBSE has cancelled my last board, which was in my strongest subject (computer science)”. However, for any email or any communication that you have with the school you want to behave like a calm and respectful adult (who by implication they would want to have at their school).