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To get admission into the MBA program at the Indian Institutes of Management (IIMs) as a B.Com graduate with three years of work experience, the most critical factor is your performance in the Common Admission Test (CAT). While a good academic background and work experience do carry weight in the selection process, a strong CAT percentile is essential to get a shortlist for the subsequent rounds.

The required CAT percentile varies significantly across different IIMs. For the older and top-tier IIMs like Ahmedabad, Bangalore, and Calcutta, you generally need a very high percentile, typically in the range of 99 and above for the general category. For IIM Lucknow and IIM Kozhikode, a percentile in the high 90s (97-99) is usually expected.

For the newer IIMs, the cutoff percentiles are relatively lower but still competitive. They can range from the mid to high 90s (94-98). Keep in mind that these are overall percentiles, and most IIMs also have sectional cutoff requirements that you need to meet in Verbal Ability & Reading Comprehension (VARC), Data Interpretation & Logical Reasoning (DILR), and Quantitative Ability (QA).

As a B.Com graduate, you might receive some weightage for academic diversity at some IIMs. Additionally, your three years of work experience will likely be considered and could earn you some points during the shortlisting and final selection stages. However, the CAT percentile remains the primary filter for getting a call for the Written Ability Test (WAT) and Personal Interview (PI) rounds. Therefore, aiming for a percentile as high as possible is crucial.

I hope it helps.