IIM Ahmedabad - Indian Institute of Management

Your academic record is tad bit below average even for OBC category. I would suggest that you should give your best and score above 99 percentile or more to expect an admission call from IIM-A, B or C.

To be eligible to be considered in the screening process, your graduation CGPA equivalent should be more than 50%.
Kindly refer to the eligibility criteria for IIM-A in details in the following link: https://www.iima.ac.in/web/pgp/apply/nri/eligibility

Your B.Tech score is below par for your admission into IIM-A. But otherwise, work experience is never mandatory to get admission into any B-Schools in India baring a few.

I would suggest you opt for MBA in general management offered by top IIMs. This will expose you to all types of possible streams in management and you can choose the one which you like. Pursuing the stream or area of your liking will not only help you build your career in a successful manner but also will help you be satisfied which you might not gain by just having a better job (not of your liking).

You can aim at scoring 99%ile or more for a call from IIM A. But getting into IIM A will depend on your interview performance along with acads hence cant be ascertained precisely.

Your 12th score might prove as a deterrent for your IIM A/S call. But dont loose your hopes and give your best in CAT. There are very good colleges which do not consider past acads!

IIM B is most probably out since, they have a hard limit on the !0th and 12th percentages (I believe it is 80%). You do have a chance to get a call from A and C, with a good CAT score/percentile.

There is no set percentage, you can play around with Shiksha's call predictor. Just try and do the best you can in every exam as your knowledge of the required percentage doesn't ensure you that you will get it. Just work smart and hard.