Hello aspirant!
Congratulations for your good score in 12,the boards.
Answering your question-
Yes you are eligible for the course as Bachelor of Arts (Honours) in English is a three year degree course offered by School of Languages and Culture. Students who are proficient in English communication and have passed Sr. secondary (10+2) with 50% marks from a recognized board are eligible for this course.
Hope this helps you.
All the best for your future.