IPM course in IIM Indore has several Arts and Commerce students without math but your Admission is not limited by class 11–12 arts or math. The entrance Test covers some class 11 mathematical topics. As a non-math student in class 11–12, it will be challenging to keep up with the 3-year IPM syllabus, but if you have cleared the IPMAT test/exam then you should not have any problems during the course. You will have the below-mentioned courses in your curriculum;
Your roommate, classmates, and professors know that you are not from a math background, so they'll help, and do peer learning. Just work harder.
Another significant thing is IPM also offers Philosophy, Sociology, Psychology, English, and Political Science. So, don’t worry much, and enjoy your journey. Hope it helps, All the best!