BCA

BCA is a basic degree in Computer Applications. It is a job oriented course which will help you to get junior developer or tester role. However for meaningful IT career you may plan your education min up to MCA.

BCA degree is a job oriented graduation degree which will help you to start your IT career in 3 years. With BCA degree you are eligible for only junior roles of Developer or Tester. Unless you complete MCA you may not get good jobs. IT industry is competitive and prefers B.Tech CS and IT over BCA. With BCA degree you can not get admission abroad in higher studies.

All are same to be honest, just a matter of few subjects here and there, rest BE Computer Science is more hardware related and has best placement Assistance.

After class 12th, you should do BCA. As today era is era of technology so BCA graduates are in great demand in the market. Now a days, computer is used in every field so there is big demand of computer specialists in the market. You will get a very good job after BCA.
If you do B.Sc non medical, then you have to do Masters degree for a good job.
So doing BCA will be more beneficial than that of B.Sc.
I hope my answer will help you.

There is MCA degree in IGNOU, for which the eligibility can be checked here.
http://www.ignou.ac.in/ignou/aboutignou/school/socis/programmes/detail/174/2
Another degree is M.Sc in mathematics with computer applications for which u may check here.
http://www.ignou.ac.in/ignou/aboutignou/school/sos/programmes/detail/165/2

Shefali you can go for M.Sc Maths if you have studied Maths in your BCA.
Eligibility for N.Sc Maths in most universities is any graduation with Maths as one of the subjects.
There are many good universities offering you the course with many private universities there offering you placement and placement assistance too. Some even offer scholarships.
Good luck.

Syllabus of different universities for BCA are similar. There may be minor differences in few electives and rigor of syllabus.