How can I prepare for IIM Indore or IIM Rohtak IPM exams? I am currently in class 11 with commerce stream and ISC board (and not showing off, I got a 93 avg in English, class 10 ICSE board).

Your English grades have no bearing on your ability to perform well at either IIM Indore, or IIM Rohtak, IPM exams. The type of English skills required to pass the IPMAT (or any other entrance exam) differs greatly from what is taught in schools. You have plenty of time to prepare and will undoubtedly do well if you are consistent in your preparation.

Begin with Pearson's IPM entry guide. There are currently no IPM-specific books available from any other publisher. Check to see if you can answer the questions. If you believe that a book alone will not suffice, consider taking online classes from a reputable coaching institute.

Entrance is not the only selection criterion; you must also prepare for the PIWAT. Practice writing essays for the WAT (Written Ability Test). The actual topic could be anything under the sun, so you must be adaptable enough to come up with something creative in 20 minutes. Look for previous WAT IPM and CAT topics online and practice them. You'll get better with practice.

Then there's PI. The conversation usually revolves around your academics, general knowledge, hobby, or general HR concerns. For that, you must be well-versed in current events from the previous six months as well as your 12th syllabus. Do general knowledge and current events in addition to your regular preparation, and brush up on your academics a week before the interview.