IIM

Depends on the company for which you are giving the interview.

Apologies for the late reply! My preference will be: IIT-D &get; IIM-A or IIM-N. The reason being IIT-D is already a well-established brand and placements would not be a big issue there unlike these baby IIMs. I agree one cannot ignore the IIM tag, but there is still lot of time before these IIMs establish themselves properly(it's been only 2 years since their existence). You may contact the current students and alumni for more insights.

Dear,
Yes, you are eligible with this percentage but you need score extremely well in CAT. Your score must be above 90%ile to get a call for GD and interview and you should work on your communication skills, GD round, market knowledge and expertise.
All the best.

There are total 20 IIMs in India and the cut-off of those IIMs are base on CAT. You need to score more than 99 percentile for top three IIMs and for other new IIMs, you just need to score more than 95 percentile.

Eligibilty criteria for seeking admission in FPM at IIMs is as follows:
Candidates are eligible to apply for the FPM program if they fulfill either of the two following criteria:
(a) Master's degree in any discipline with 55% marks (or grade point equivalent) throughout academic career. (or)
(b) Bachelor's degree of at least four year duration (such as B.E./B.Tech./B. Arch.) from a recognized University/Institute with 55% marks (or grade point equivalent)
If you meet above mentioned criteria, you are eligible to seek admission in FPM at IIMs.

Here is the list of MBA colleges other than IIM institute who has good placement record. Check the link upon colleges for more details:
Xavier Labour Relations Institute
Faculty of Management Studies (FMS)
S.P. Jain Institute of Management and Research
Indian Institute of Foreign Trade
National Institute of Industrial Engineering
Xavier Institute of Management, Bhubaneswar
Symbiosis Institute of Business Management, Pune
Department of Management Studies, Indian Institute of Technology Delhi- Kampuzz.com
Jamnalal Bajaj Institute of Management Studies
Vinod Gupta School of Management, Kharagpur
Shailesh J Mehta School of Management

Hello Boora,
It's actually very simple. If you have a dream then one has to work hard to achieve that dream. You have enough time. Start studying diligently and sincerely.

Second option is better as you will get some experience too. IIM, Shillong does not have 100 percent placement.