Hi,

Since you have not mentioned the name of any college or any university, I am assuming you are talking about Delhi University as you are talking about deduction of marks. If you have not studied Hindi as one of the core subjects in 12th boards then you will not be eligible to apply for studying BA Honours degree in Hindi.

For more information, you can refer to this:

https://www.du.ac.in/du/uploads/COVID-19/pdf/Illustrative%20examples%20to%20calcaulate%20percentage.pdf

Hope this helps.