Hi there,

Yes you can go for Bachelor of arts focused in English even though you are from bengali medium.

See,it never matters what you wished to study in future.

You can apply for this course in various colleges based on your preferences. But before entering into college  you must understand English language with everything like noun,pronouns, sounds etc.

Check this link for more detailed information: https://www.careers360.com/courses/bachelor-of-arts-ba-english

Hope this answer will help you.

Thank you and very good luck:)