I have graduated in English Literature but do not have this subject in B.Ed. Am I eligible to teach 2nd and 3rd class students?

Yes, you can teach second and third class students even if your B.Ed. Most schools require a B.Ed degree to teach basic subjects, irrespective of your basic education. Having a B.Ed, you meet the special qualification to teach the minors. Schools are often looking for ways to cater to young children