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There is always a scope for the improvement of your result by seeking permission from the Board to appear in the papers in which you would like to have improved performance.
You have to take a permission through the Board via School - authority for the appearance of reevaluation of papers which you would take in the re- examination for your improvement.
You will be issued a fresh mark- sheet indicating your latest performance in the examination.
However, you have to put in your best efforts in your studies so that you can achieve a commendable performance in the papers you would like to have improvements.