Are grace marks given for 3 subjects ?
Rajashree, See, it is very difficult to predict whether you would be given grace marks or not as it solely depends on your educational board and its' normalization norms. Now, if your exams of these 3 subjects are done, then you cannot change anything and thinking about the marks or the chances of passing would not do any good, rather focus on other subjects so that you can compensate for these "not-so good" performed exams but if you are yet to appear for these exams and facing "exam anxiety", then do not think negatively about the chances of passing rather your focus should be on your preparation only. As regarding grace marks or what some technically refer to as normalization, it is very difficult to predict if there would be grace marks given, although most of the authorities have a policy of normalization of marks in case of marks being very close to passing marks, so you should hope for the same. However, you should not predict anything until the results are out as you never know the examiner's thought- process while checking your answers, so all you can do is to hope for the best and prepare for the other exams, if there are any.
Good Luck.