Computers & IT (Non-Engg)

This would depend a lot on your interest areas & career aspirations. However, since you have done 12th in arts you should pursue BBA. BCA (Bachelor of Computer Application) is a technical course and one would need good computer skills plus an HSC in science would be necessary to seek admission.
BCA c

55% is the minimum percentage that you need in clas 12th.

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

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.