Each IIM has different criteria to take admission some of them prefer academic records & some prefer your CAT percentile & your overall profile as well as your performance in selection round where you can prove yourself on the basis of your CAT score & your performance.

just start preparing for CAT get around 96 and above percentile 

it will definitely propagate you towards your ambition.

It depends on the student's capability & the company so it would be tough to give you the exact package.

To get admission in top IIM you require 98 + & for other top colleges 95+ . There are many other factors to get admission in top bschool & IIM like your caste category, your overall profile & extracurricular activities.

Hi, Resume is an impression you shall form in front of the interview panel. Being a fresher, create a resume which is full of activities done throughout your academic career. Key points are:
1. Put importance on previous internships and your accomplishments. Be specific and just not clutter things.
2.

Hi, First thing is just on the basis of your academics it cannot be decided that you will get into good IIM's or not.  You have decent academic record. You should focus on  CAT exam because out of the total weight-age 70% is on CAT percentile. Also your interviews and

I am assuming you are from general category. Based on your overall academic profile, you will need to score atleast 99.5 percentile in CAT to get a call for the next round of IIM A, B, C, FMS

All the best!

Your academic profile is below average and it could or perhaps would be a hindrance for admission in top IIMs. The only way you can counter the same is by scoring exceptionally well in CAT. For the top 3 IIMs you may need to be a 100 percentiler. 

All the