Hello,

With a CUET score of 315 out of 650 and belonging to the OBC category, you have a decent chance of securing admission to the BA LLB program at Allahabad University. Admission criteria can vary each year based on the number of applicants, the difficulty of the exam, and the cut-off trends. However, typically for OBC candidates, a score around 50% or above might be competitive.

To get a more precise idea, you should check the following:

1. Previous Year Cut-offs : Look at the previous year's cut-off scores for the BA LLB program for the OBC category.
2. University's Admission Criteria : Review the specific admission criteria and any additional requirements set by Allahabad University.
3. Rank : Your rank in the CUET can also play a crucial role in the admission process.

I recommend visiting the official website of Allahabad University or contacting their admission office for the most accurate and updated information.

Hope it helps!