Hey.
It would depend if Maths was among your main subjects or if you opted for maths as an additional subject. So if Maths was among your Main subjects then you will have to clear the compartment exam to be eligible to take admission in any college further for BSC LLB as the eligibility criteria for college providing the course is to pass in Class 12th from a recognised board. Some colleges even require a minimum aggregate of 45% marks in 12th to be eligible.
So if Maths was one of the additional subjects, then it is not a problem as you will still be declared as pass. And as long as you fulfil the above mentioned eligibility criteria you will be able to take admission for BSC LLB.
Best of luck