Hello Alok,

According to your marks and comparing with the cutoff released by allahabad university, it is unlikely you would be able to get admission in the main campus with 120 marks in the entrance test OBC category. The cutoff is 152 marks and above. You should go for other affiliated colleges of allahabad university.

More - https://university.careers360.com/articles/allahabad-university-cut-off

Hope this helps.