If you are giving the improvement exam only for theory and you have already passed the practical exam earlier, then you do not need to give the practical exam again. Your previous practical marks will be counted. But if you had failed in the practical, or you did not give the practical earlier, or if you are changing the subject that includes practical, then you will have to give the practical exam again. Rules can be slightly different for each board. If you tell me your board name (like CBSE, UP Board, Maharashtra Board), I can confirm the exact rule for your board. website: https://cbse.gov.in https://upmsp.edu.in https://mahahsscboard.in