Hey poojitha

It’s Ok if One Fails In Supplementary Subject. The Person Have To Give Only The Paper In which He / She is Failing. No He / She Dont have to Give All The Subjects Papars. But, On a safer Side You Should ask Your Teacher Or Mentor , Because In my Opinion The  person Only Have To Give That Particular exam in Which He / She Is Failing. I Hope That Student Will Work Hard And Passes With Flying Colours.

 I Hope It Helps 

Good Luck