Hello,

I don't get your question dear. Because 12th class examination if you fail then you have to appear for next year or only clearance the fail subject that is after few months. But you said 12th classe fail. I think you want to know about the 12th class test examination which take every schools before the board examination. So if you are failed your test examination then may be there some consciousness appear. Like they will call your parents and call you and they will give extra classes more assignments for ready for board examination. No one change your science stream dear. So try to not fail the examination give your best you can be pass.

All the best.