Hello there,

Listen, If you wants to Complete your class 12th then each and every Subject is compulsory. If you fails in any subject, then sorry to say you have to repeat the class12th. Because passing in every subject is compulsory for applying in a reputed University.

Not even you need to passed all those  subjects but you also have to achieve good marks , Because in Every college or University from where you will going to complete you graduation , they will prefer those students who have excellent Academic background.

Every University have they have there own criteria of giving admission, some will take merit based admission and most of the Institution give admission on the basis of Entrance exam score.

Hope I have  cleared your doubt.

All the Best!