See since you are from arts background, and you also have a good academic record (barring your graduation percentage), so you can get a call for interview even a slightly lower percentile.

According to the previous trends, you can easily get into IIM Ahmedabad even at a percentile in the range of 92 to 95, which is a safe estimate for your admission in the OBC NCL category.

Hope I have answered your question. All the best!