Hello,
As per the eligibility criteria of BHU UET for B.Sc.(Hons) Maths, the candidate is required to have scored in 10+2 or equivalent examinations with a minimum aggregate of 50% of subjects physics, mathematics, and any one of the following subjects: chemistry, statistics, geology, computer science, information technology and geography. All the three subjects must have been cleared by the candidate. So, I think you are eligible to apply for the same.
All the Best
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