Hello Aman,
There is nothing like that. So no need to worry about it. It does not depends on an individual's choice to choose the language subject in BA program. You have to study both Hindi as well as English but the difference is these subjects differ according to semesters. For instance; if you have studied Hindi in 1st sem. then in next sem. you have to study English.
Now the question is of percentage deduction. It will happen only when one changes the stream from intermediate level to graduation & depends upon the college in you are taking admission.
Suppose you have passed out your 12th from science stream but you want to graduate from commerce or art course then it will lead some deduction in your percentage someabout 2% - 5%.
Hope you get your answer.
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