As per the information available, There are no strict instruction about the eligibility criteria and any student who have passed 10+2/intermediate can apply for the course of BA English Hons in St. Stephens College. As you St. Stephens is one of the best colleges in India so you must be very sure that you have very good marks in your board in order to seek an admission in St. Stephens. The competition is so high that >90% aggregate students practically get lesser possibilities.

To know more about the course and the college, visit the link below:

https://www.careers360.com/colleges/st-stephens-college-delhi/ba-english-hons-course-2

TO know more about English as a career choice, visit the link below:

https://www.careers360.com/courses/english-course

I hope this answer helps. All the very best for your future endeavors!