B.Sc Maths

Hi,
If you are dedicated to pursue CA, definitely, you may pursue CA. CA offers three level exams as:
(a) Foundation
(b)IPCC
(c) Final.
All non-commerce students may join CA-foundation. You may also join any coaching classes to continue your preparation.
All the best.

Data scientists are in a high demand now a days, so go for statics.

As a Mathematics graduate, you would have superior numerical skills, therefore MBA in fiancee can be very good option for you. If you have good computing skills, you can also evaluate MBA in IT with specialization in Data Analytics as an alternate. You are eligible for all MBA specialization options. You may chose any based on your interests, strengths and personality to excel in professional career.

Yes, you can if you are a working professional. If you are not working in anywhere, then please choose a good regular college because B.Sc in maths is not easy.

Hello Riyanka,
Following are the higher studies options after B.Sc. in statistics:
M.Sc. in Actuarial Science
M.Sc. in Library and Information Science
M.Sc. in Quantitative Economics
MCA
Masters in Math
Masters in Statistics
MBA
P.G. Diploma in Stat. Methods with Applications
Specialist Development Program in SQC
JRF & SRF Rules
Junior/Senior Research Fellowship

Yes, you can get admission in St. Xavier's College, Mumbai with 81%.
Good luck!

Yes, you can pursue PGDCA from a deemed university. You can also prepare for CAT or other competitive exams.