IIM Indore conducts an entrance exam called IPMAT (IPM Aptitude Test) for inducting students in its 5-year Integrated Program in Management (IPM) course, the form for which is usually released in the month of May each year.
The test has three sections, i.e. Quantitative Ability (MCQ), Quantitative Ability (Short Answer), and Verbal Ability (VA). So naturally Mathematics and English are the two subjects you should focus on to ace the exam. In mathematics topics such as probability, trigonometry, mensuration topics such as area, volume and perimeter should be your top priority. A good grip on class 10 mathematics will definitely help you.
In English, you need to be proficient in the language. Grammar, reading comprehension through paragraphs, and punctuations are some of the most important topics to cover in the language section. I hope if you practice enough, you can easily cross the cutoff of the test.