I got 74 in 12 class and I should repeat the 12 class so it is mendatory that I repeat whole 12 class
Hello aspirant,
No, it is not mandatory to repeat whole class 12th in order to be able to increase your percentage. You can give re-exam for as many subjects as you want.
For example, if I scored low in English and Mathematics exam, then I can reapply for both exams and increase my percentage.
Incase, you score lower in re-exam, than your original marks remain intact.
Hope this helps.