National Law School of India University, Bangalore

Yes, NRI quota is available. There are 5 seats for people belonging to NRI and NRI sponsored category.
For information related to fee, refer to the below link:-
https://www.nls.ac.in/index.php?option=com_content&view=article&id=43&Itemid=28.

Minimum eligibility for LL.B is graduation. So if you haven't completed your graduation, then you cannot opt for LLB. The only option will be to go for BA LL.B.
Placements depend on the college one opts for LL.B. While NLUs have good placements, other colleges do not. The scope of placements extends

No, it won't. Without a law degree, how will you get into a law firm?
A Diploma in IPR won't get you a better position because there are people out there who have done Masters in IPR laws and they will be preferred obviously.

Yes, around 5-6 AC in one class room.

I don't think there are any entrance exams for MBL.

The approximate placement salary is INR 12-14 lakhs per annum. This varies every year as the average package is on the rise every year. Top recruiters are AZB, Shardul Amarchand Mangaldas, Khaitan, Luthra & Luthra among others.

Yes, it will provide you the necessary insights into business laws specifically and would help in improving your corporate laws acumen.

I don't want to name any institute per se but the institute which offers the best material and provides for doubt clearing sessions would be the best one.

Yes, NLSIU is a national university.

If you are a dropper, then you need to spend around 8 hours a day. Time on individual subjects would depend on what you are good at.