Hello,

IIMs look for Class 10th,12th and graduation percentage along with CAT Score before offering admission to a candidate. Work Experience is a plus but not mandatory. You have decent score in Class 10th,12th and graduation. For getting the top 3 IIMs that is IIM-A, IIM-B or IIM-C you need a CAT percentile between 99.6-99.9

Click at this link to know about CAT - https://bschool.careers360.com/exams/cat

Hope this was helpful