MCA

As per your degree B.Sc in computer science, you must have to do M.Sc in computer science.

Dear,
You are not eligible as:
MCA eligibility is any graduate who has passed or appearing for the final year degree examination in any discipline (science, commerce, arts, engineering or any approved university) is eligible to apply.
Candidates must have mathematics as a subject in their 10+2 course or any one year of graduation. BCA qualified candidates can also pursue MCA.
So, I would suggest you to go for MBA course.

Yes, you are eligible for doing MCA as eligibility for MCA is +2 with maths and a graduation course. You have both. So,
good luck!

RV College of Engineering, since it's one of the top college of Bangalore.

It's 1.3Lacs INR for 1st year and 1.23Lacs INR for next years.

You are advised to do Postgraduate Diploma in Data Analytics. PG Diploma in Data Analytics from IIIT Bangalore is a good option for you. The 11-month online PG Diploma program, co-developed by IIIT, Bangalore and UpGrad, covers the depth and breadth of the subject in the form of interactive lectures, live sessions and a 3-month capstone project mentored by industry professionals. IIMB offers a one-year certificate programmed in Analytics. There are many other options available to you to become specialist in Data Analytics.

Hello Satyanarayanan,
The link below gives you the list of MCA colleges in Karnataka:
https://www.shiksha.com/it-software/colleges/mca-colleges-karnataka
All the best.