hi,

see you did not mention the exam name or which of the education board you have appeared for the h.s exam. however generally the compartment exam held in the same year for the students who get supplementary in any subjects. however if you want to reappear freshly in next year you may participate as private candidate or may join nios education board. you need to contact with your institute authority or you may check the official website for the particular board for exam updates.