Hello Aspirant

If you forget to write one question number in your Class 12 HSC board exams, it could potentially lead to a deduction in your marks for that particular question.

It depends highly on your evaluator. If they want, they may award you the marks for that answer. But if they don't, they can skip that answer and not even check it because they have been instructed to ignore any answer that has no question/answer number attached with for reference.