For IIM/CAT eligibility, the key academic criteria are:

1. 10+2 or equivalent: IIMs require a “10+2 or equivalent” pass certificate.

2. Graduation: You must have a recognized bachelor’s degree or be in the final year of your degree.

Since you did a diploma after 10th, and now you are doing Engineering (B.Tech/B.E.), the situation is as follows:

• Most IIMs do not consider diploma marks as a replacement for 12th marks. They usually require your 12th marks for the academic eligibility form and percentile calculation.

• However, some IIMs allow 10th + Diploma marks for academic score calculation in special cases, but this is rare and usually clarified in the IIM admission broc*ure.

• For CAT, your graduation marks carry the highest weight. Your 12th/diploma marks are a smaller part of the overall calculation for percentile-based shortlisting.

• Use your 12th marks if available, because that’s the standard requirement.

• Highlight your diploma marks in your application or resume as an additional academic achievement—it won’t replace 12th marks, but it can strengthen your profile.