Life of IIM students has no comparison.Because they are placed with such a lucrative packages which a student of average college can get after 10-15 years.and brand name of IIM remains permanent till end of life.An average college student get placed with low package than IIM student and roles offered

Yatin yes there are some firms like Goldman Sachs, Fidelity etc. which offers a role of Investment Banking. Your question whether they come regularly or not; generally these companies visit atleast all old IIMs including IIM Shillong but what role they are offering varies every year depending on the economy

Sandeep, first of all, a general student won't even get selected into any of the IIM with 90 percentile in CAT. It's percentile, not a percentage, I think you must have misjudged it. For even getting into new IIMs or ultra new IIMs you need to atleast have 95+ percentile.

Yes, you might get a WATPI/ GDPI call from IIM Shillong and MDI Gurgaon at 98.2 percentile in the CAT. However, getting an Interview call also depends upon various other factors such as Class 10, Class 12, Graduation scores, work experience, academic and gender diversity, etc. along with the CAT

Eligibility criteria for FPM Programme in IIM Shillong:

• Candidates must possess one of the following qualifications to apply for IIM Shillong Fellow Program in Management: 
• A Masters Degree in any discipline, with at least 55% marks (50% marks for SC/ST/PWD), with a Bachelors degree/ equivalent qualification with at-least least 55%

Hey

Here I am sharing with you a link which would help you 

No, you won't get a call from IIM Shillong with 50 percentile even if you are an SC student. IIM Shillong which is considered as one of the old IIMs after IIM A, B, C, L, K and I is also a premier institute and for getting a call you

I am assuming you are from general category. Based on your overall academic profile, you will need to score atleast 99.9 percentile to get a call for the next round. fees is around 21.5 lakhs

All the best!