With your academic background, you have a good chance of getting into some of the top IIMs. Here's a breakdown of your profile:

- Class 10:91.6% - Excellent!

- Class 12:66% - Average, but not a deal-breaker

- B.Tech Computer Science: 8.4 CGPA - Very good!

Assuming you score well in CAT , here are some IIMs you might have a good chance of getting into:

- IIM Ahmedabad: Although the qualifying CAT cut off is 85 percentile, the final cut off typically goes up to 99-100 percentile.With a good CAT score, you might be considered.

- IIM Kozhikode: The CAT cut off for IIM Kozhikode is typically around 95-98 percentile. Your academic profile and a good CAT score might make you a competitive candidate.

- IIM Indore:The CAT cut off for IIM Indore is typically around 90-95 percentile. With a good CAT score and your academic background, you might have a chance.

Keep in mind that CAT cut offs can vary from year to year, and other factors like work experience, extracurricular activities, and personal interviews also play a significant role in the admission process.

To increase your chances, focus on scoring well in CAT, and make sure you have a strong overall profile.