Hello,
Boards follow grace marks policy in some of the cases only. It is not necessary that the board will give you grace marks easily. There are situations like if a question is wrong or the paper is very tough then the board declares grace grace Marks for the students. Also, it depends on the checking of the teacher as well. Do not worry, you will be able to get good marks without thinking about the grace procedure. Always make sure that you attempt all the questions because the marks are awarded for the steps and format as well.
All the best,
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