Information Technology

After completing your BCA, you can opt for the following programmes:
Master of Computer Applications(MCA)Masters Degree in Information Management (MIM)Masters in Computer Management (MCM)Post Graduate Program in Corporate Studies (PGPCS)Information Security Management (ISM)Master of Business Administration (MBA).

Career Opportunities after MCA:
Software Developer/Programmer/Engineer:Troubleshooter:System Analyst:Software Application Architect:Software Consultant:Hardware Engineer:Technical Writer:Systems Developer/Engineer:

Yes sure, you can apply for M.Sc. In Mathematics after BCA. You must have a studied Mathematics in your graduation, if you are studied mathematics as subjects then you are eligible to apply for Master degree programme in Mathematics. You can also apply course like MBA, MCA M.Sc. (Comp), M.Sc. (IT). .

https://www.shiksha.com/it-software/colleges/bca-colleges-india
Here is the list of the top college of BCA in India, you can follow the link to get their admission procedure and other official details.

https://www.shiksha.com/university/jamia-millia-islamia-jmi-delhi-843/admission
Here is the complete admission procedure to get admission in this college
you can refer the link for official information

For admissions in MA Economics programme, candidates must have a Bachelor's Degree in any discipline securing at least 50 percent marks aggregate, with knowledge of Mathematics at 10+2 level.

Yes, you can take but you should be able to study discrete mathematics in your curriculum.