Hello student.

Hope you are doing well.

Yes you can write answers in boards in English or Hindi which language as per your interest or in which you feel more comfortable.

It is quite understood that if a person studying in English till class 10 and suddenly shifts to Hindi language in class 11 and 12 is a bit difficult for him/her. Also the words, meaning everything is different in learning and writing.

See boards exam is printed in both Hindi and English language means a question will be written in Hindi language and also in English language for both language category students.  It is completely upto you.

So study accordingly and hope you have a brighter future ahead.

Good luck!!