Hi Roshini,
Actually, it totally depens on the teacher checking your test Copy!
If they find that student just need 2-3 marks to pass then generally they give that and pass you in that particular subject!
But, there are always some teachers who have their own set of protocols  and who don't care whether you pass or fail by 2-3 marks!..So if your copy goes in hands of such teachers then obviously they are not going to reward you even a single extra mark!!

So,Just pray to God and  if you are lucky enough your copy will be checked by some kind hearted teacher!
Good Luck!!