B.Sc Maths

Yes.
For B.Sc Maths Hons in DU, they will compulsively look at your best 4 subject aggregate
These 4 subjects include maths and English compulsively with any 2 other subjects mentioned in their list.

Hi, St. Xaviers College Kolkata has the below criteria for admission.
1. Eligibility:
Compulsory Subjects in 10+2: Mathematics
Aggregate Calculation: Mathematics and any of the other 3 subjects
Marks required for application: Aggregate 60% & 60% in Mathematics
2. Selection
On the basis of index calculated with the board marks in +2 level.
Thanks.

It depends on the branch you want to take in M.Tech
you can check it on the link below:
http://www.srmuniv.ac.in/admission-india/engineering/admission-procedure-eligibility

I think you can do BA Maths hons., but not B.Sc. Maths, because that course is for Science stream student.

BHU, DU, Wing Christian College, JMI, AMU are the best universities for B.Sc.

Yes, you are eligible to apply for M.Ed. You can join any good college for M.Ed. It will help you in future in making your career. Now days master's degree is in demand. You should join this course as you are eligible for this.
Good luck.

Hello Zeal,
As per your query, BBA is beneficial. If you are determinate of pursuing MBA. Else, B.Sc Life sciences +MBA is good combo. But, B.Sc. Maths+MBA is not great combo. Think and make right decision. All the Best for your future.

Please mention the location so that I can tell the best colleges in your desired location, but some of the best colleges are listed below:
Loyola College. Miranda House. Miranda House. Hansraj College. Hansraj College. Fergusson College. Fergusson College. Madras Christian College (MCC) Madras Christian College (MCC). Hindu College. Hindu College. Sri Venkateswara College. Sri Venkateswara College. Ramjas College. Ramjas College.