Hello there. Hope you are doing good. I am listing down the names of colleges which are best for pursuing bachelors in eco (hons) course :-

1. Shri Ram College of Commerce, Delhi University
2. St. Stephens College, Delhi University
3. Lady Shri Ram College, Delhi University
4. Miranda House, Delhi University
5. St. Xavier's College, Kolkata
6. Loyola College, Chennai
7. Christ Univeristy, Bangalore
8. Presidency University, Kolkata
9. Madras Christian College, Chennai
10. Hindu College, Delhi University

These are some of the top colleges which provide bachelors in eco (hons). I hope you found this answer helpful. Good luck for your future.