These are the best Indian colleges for a bachelors’ in economics-
The ones that follow merit based admissions, mainly look at the Math and English scores of the candidates. Some of them take Math scores quite seriously. It is even better if you had economics as a subject in your +2.
An economics background may give you some benefit in the cutoffs. Some others follow entrance test based admissions. They’ll consider both your +2 marks and test scores (more weightage to +2 marks). You may consider a UG abroad, it is totally worth the trouble.