MCA

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.

B.Tech IT is a better option in comparison to B.Sc IT-MCA, as you will save up to two year, as it will take four years to do B.Tech in comparison to six / five years for B.Sc IT-MCA. Indian IT industry treat B.Tech IT and MCA on par, but below BTech CSE.

This would depend a lot on your interest areas and career aspirations. MCA is a technical course, whereas, MBA has to do more with exposure to management concepts.