Hello Anand,
Yes,Having a mathematical background has almost no bearing on BMS and the subjects that fall under it. Only 3 subjects viz Operations research, Statistics and Business Mathematics and topics under its fold may be familiar with math student,but other than that,everyone is on the same level.
To get admission in Narsee Monjee college in BMS a candidate must have passed 10+2 from orMH state board of higher secondary education or it's equivalent examination with atleast 45% aggregate. Diploma candidates with 2 or 3 years course in any engineering branch are also eligible to apply.
So there mathematics is not a mandatory subject that a candidate must have studied in 10+2. So you are eligible to apply and get admission if you have secured the minimum percentage in 10+2.
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