CBSE 10th

It depends that how less the marks really are!
You can still find out colleges that do not require high percentage as eligibility criteria for taking admission in M.Sc maths. Scoring less is not an issue, a number of colleges provide admission even though a candidate has less marks in previous qualified degrees. You find out more about such institutes which invite applications for your desired course. Go to their website, if the college is in your hometown, visit the same. Or else call on the toll free numbers of various Universities and enquire about the eligibility criteria as well as admission procedure.
I am sure, you would find one. However, yes, work hard this time and fetch good marks in M.Sc. As you know, the graph should go upward as you proceed further with your career, as this will justify your performance and seriousness as a candidate for job or so.

Bachelor of Arts + Bachelor of Laws [B.A. L. B. ] is a dual degree professional course in administrative law. BA LLB is a five-year course. Having passed 10+2 or equivalent exam from a recognised board with a recommended minimum of 50% on aggregate, a candidate may apply for this course. Admission to most of the law schools/universities is done through a national level or university level entrance test. Eligibility Of the Bachelor of Arts + Bachelor of Laws [B.A. L. B. ]
The eligibility conditions for BA LLB course is scoring minimum aggregate marks as per the requirement of the institute in senior secondary examination or equivalent examination from a recognised board. The general entry route to this programme is through an entrance exam. Since entrance exam is the preferred mode, the candidates with their results awaited in senior secondary examination are permitted to apply for the course. In some institutes, direct admission is another entrance route offered to this course.

There is no chance that you can write examination of class 10th without mathematics as mathematics is compulsory subject in class 10th. Yes, you can opt commerce only. Some part of economics also compulsory in class 10th. You have option to select your desired subjects. So, you can have commerce art or science as option of studies. For BBA qualification is class 12th pass in any branch commerce science or art. Yes, you can study BBA.
But, these subjects are core subjects for BBA, you have to study accounts and management subjects in entire syllabus. Mathematics is compulsory in first semester of BBA second and third semester, you have to study statistics, statistics is part of mathematics. Yes, your IQ will increase when you will be students of BBA. You have good will power so sure you will clear all these subjects without any problem.