Hi Chandan,
BHU is a university of national importance so surely pursue your under graduation form there is a good thing. Now when it comes to scope then it all comes to you. What you wish to pursue?
If after completion of your graduation you want to get deeper knowledge of your field you can opt for M.Sc followed by M.Phil or M.Sc
If you want to pursue post graduation in management then you can for prepare exams like CAT, XLRI etc.
If you wish to secure a job in government office then while in the final year of your graduation you can take up coaching classes for the same and appear for those exams.
Please keep this in mind that each of these options has their own set of hardships, pros and cons. So please choose them wisely.
All the best!
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