Colleges in Bangalore

No, you must be a student in Karnataka for minimum of 5 years for writing govt. exams in Karnataka.

ComedK fee structure will be slightly less than the management fees in REVA University.

Kindly refer to last year's cut-off of admission in REVA University of NATA. Keep your rank with +/- 2k and opt for admissions.

You can Join REVA University by writing university entrance exam through Management Quota

Comedy k and Management quota have very less difference of 20-40k.
Comedk fees is fixed by comedk authority, apart from that college fees ranges from 40-50k.

Yes, there is course of Bachelor of Science in Indian institute of Science. You can apply to get admission there. You will get admission there.
Good luck.

Its good. But there are better options. Christ is good for management oriented courses.

Bachelor of Journalism and Mass Communications (B.J.M.C) is a 3-year duration undergraduate program for students who wish to pursue their career in Journalism and media industry. The eligibility of this course is 10+2 or equivalent with 50% marks from a recognized university or board. Average fees for this course will be incurred from INR 50,000 to 1, 00,000 depending on various BJMC Colleges.

You can do B.Sc IT or BCA from Bangalore.
There are many colleges in Bangalore.