BCA

BCS mostly subject matter is focused on core maths and physics rather computer Science, here is less computer Science material than BCA/BIT/B.Sc(IT).
BCS is basically for those students who want to do further study with combination of Core math and computer OR make career in Applied Mathematics where mathematics can be used with help of computer Science knowledge like computer programming.
Its just like same B.E and B.Tech, B.E degree awarded in old engineering colleges whereas for last 10–15 years B.Tech is rewarding.
there is not a big difference, just B.tech degree gained more practical exposer than theoretical like in B.E.
Conclusion - There are no any big difference BCS and BCA.

Hi Naman,
Every institute has it's own course specific fee structure. In order to know the exact fee it would be always advisable to browse through the official website of the institute where you wish to apply.
If possible go through the alumni speak section to get an idea what the alumni thinks about the institute. However, we can help you with the parameters that you can keep in mind while choosing an institute. You can consider the below parameters :
1) Faculty,
2) Affiliation / Recognition
3) Course Material,
4) Quality Education,
5) Fees
6) Infrastructure
7) Success Rate.
8) Placement
9) Top recruiting companies.
Please feel free to discuss more.
Wish you luck.

HI Naman,
Bachelors in Computer application (BCA) is one of the popular options to make a career in information technology. It is an undergraduate academic degree in computer application. The duration of this program is three years. It is equivalent with B.Tech/B.E in Computer Science or Information technology. This program demonstrates sound knowledge in key areas of computer Science or industrial computing. It also carries out the required analysis and synthesis involved in computer systems, information systems and computer applications.
Eligibility:
To be eligible for BCA, you should have passed 10+2 from any stream with English as passing Subject with minimum 45% marks in aggregate
Career prospects:
After the successful completion of the program, a student should be able to get entry level job in the field of Information Technology or ITES.
BCA graduates can also start their career as programmers and rise to that of senior programmers.
Software Development & Design in companies like Microsoft, Oracle, Wipro, Infosys etc.
System Administrator in big corporate companies like Citibank, HLL, P & G etc.
Training & Development in companies like NIIT, Cisco etc.
Hope this helps. Wish you luck.