Science

B.Sc with Zoology/Fisheries/Fishery Science/Aquaculture/Industrial Fish and Fisheries as one of the subjects in three subjects of equal importance/B.Sc., Degree in Fisheries or B.F.Sc are the most preferable branches for M.Sc. Aquaculture.

Basic eligibility criteria for this course is that applicant should have completed graduation from a recognized university. Since you have completed your graduation in B.Sc Maths, you are eligible to pursue a course in M.Sc IT from Sikkim Manipal University, Directorate of Distance Education. Moreover, you will be given preference over other candidates as you have a B.Sc degree.
Admission Process:
Register and Apply
Interested candidates can apply online with the required information.
Merit Screening
Admission is based on the marks obtained in graduation.

Yes, you are eligible for M.Sc, but please check eligibility criteria for the institution/University, because different universities have different eligibility criteria.

Yes, you can apply for the integrated BCA course. To be eligible for the course, you only need to have cleared your 10+2 from a recognized board of education in any stream with an aggregate of 50% marks in the best 5 subjects (including English). Having IP in HSC is not necessary.

RCC Institute of Information Technology, Kolkata
West Bengal University of Technology, Kolkata
Jadavpur University, Calcutta
Meghnad Saha Institute of Technology, [MSIT] Kolkata
Techno India Saltlake, [TIS] Kolkata
These are the best colleges for MCA in Kolkata, for colleges offering MCA without mathematics, you need to check the college eligibility individually.

Yes, a B.Sc (PCM) student can pursue a PG course in forensic Science. Basic eligibility criteria for a student to qualify for a PG course in forensic Science is mentioned below. Please note that this criteria may vary with different institutes.
Primarily, the criteria include:
Bachelor's degree in Science/ engineering / pharmacy/ medicine, obtained from a recognized university.
A minimum aggregate score of 60% marks at the level of graduation is required.