Among the above B-schools, FMS will be easier to enter because other IIMs like IIM K, IIM L, and IIM I give more weightage to past academic performance. FMS selection will be based on Personal Interviews, Group Discussions, and CAT scores.
IIM K gives 40% weightage while the initial shortlisting of candidates for Personal Interviews is contrary to IIM L and IIM Indore which gives only 20% weightage. IIM Indore gives no weightage to work experience where IIM K gives only 5% and IIM L gives 10% weightage.
All in all, if you are a mediocre student then you have to outperform others in terms of CAT score and PI/GD performance. Indore is home for freshers and competing here will be difficult but you should focus more on FMS then IIM L and then IIM K for your shortlisting and put your best foot forward and convert your calls.
All the best and Best of luck for your D-day.