Pranav, CAT score has only a certain weightage in the shortlisting criteria for the next rounds of IIM. Your 10th, 12th and graduation marks have around 30 to 40% weightage varying from IIM to IIM. With your previously academic performance, it might be a little difficult for you to get a call from the old IIMs. It requires around 99- 100 percentile to convert a call with your marks. Although you can expect a call from the new IIMs, it might be a little difficult for you during the interview as you need to have a satisfactory answer for your performance in graduation. Nevertheless, you focus on preparing for the next rounds and keep behind your previous performance. All the best.