IIM Kozhikode evaluates your academic accomplishments in this manner- 75% for CAT score, 20% for class 12th score, and 5% for academic diversity.
You have an average academic performance throughout, and do not belong to the academic diversity quota. In this case, a CAT percentile of 99.2+ will be required to get you a call from IIMK. After which, your admission will be based on your performance in GD PI. My brother had the same score in his 12th boards as you. He ended up receiving a call at 99.25 percentile.
Try getting a high CAT score to get a call from IIM Kozhikode.
The IIMs generally have a 2-3 stage process of admission but IIM Kozhikode follows an admission process that is a 3 stage one. It is described as follows:
The required percentile changes every year so it is difficult what percentile will ensure a call. So, keep a target of 99 percentile, to be safe.
Keep yourself up to date in general knowledge, HR-based questions, academics, current affairs to stand out in the interviews. Work experience is also a big plus.