Minimum percentage required for an open category student is 60%. So considering your profile you have a high chance of getting into IIM Indore for IPM.
But the admission criteria of IPM Indore involves a composite score and a small part of it is 12th marks. The 2 parameters that are considered are
Aptitude Test Score- 65% weightage
Personal Assessment- 36% weightage
Your 12 marks come under the PA or Personal Assessment. But the weighting is very less. Maximum weightage is given to the interview that is conducted after shortlisting.
So you can easily compensate for your low 12th marks with higher marks in Aptitude Test and Personal Interview.