Greetings Ramkumar!

Hope you're doing great.

You have a decent profile to give a shot for IIMs Especially the new ones. Common Admission Test(CAT) is one of the most difficult management entrance examinations in India. Every year more than than 2 lacs+ aspirants appear for the best and the only handful of creamy layers get admission into IIMs. 

Now, assuming that you've scored 99 percentile and belong to General Category then the chances of getting into top IIM(A+B+C) is low. The competition is tough and especially for those who belong to Engineering Background. There are students with stellar records such as 90+ overall and there is priority 1 when it comes to allocating the seats. Let's take an example, suppose you're aiming for IIM Ahmedabad then: From your previous academic score you'll get somewhere around 8+6+5=19 as your AR(Application Rating Score) out of 30. Then in order to compensate your Composite Score close to 0.73(which was the cutoff of 2018), you must score around 99.7+percentile. Every single percentile added in the end will make a huge difference for getting a call. Hope things are clear now. The stakes are high and one should focus on getting as high CAT score as possible.

However, there are many other institutes where you'll have a clear shot at admission. Such as FMS, IMT, MDI etc. These institutes are at par with any top IIMs and have amazing placements. FMS is known as the best ROI b-school. Do check out all the options. 

For more details regarding CAT examination please do follow this link: https://bschool.careers360.com/articles/cat

All the best!

Cheers!