Does IIM Indore weigh only about 20% of a CAT score?

Yes, the admission in IIM Indore is conducted in two ways - (a) Writing Ability Test (WAT) followed by the Personal Interview round (PI); (b) Final admission process.

• To be eligible for shortlisting for the Writing Ability Test and the Personal Interview, you must meet the eligibility criteria. 
• Your profile will be scrutinized based on your CAT score which carries 20% of the weightage.
• In addition, your score in your class 10th carries 36% while 12th marks have 40% weightage.
• Moreover, 4% weightage is allotted to Female students for diversity in gender.

Among the shortlisted students, the final admission process is based on: 

In both the WAT and PI rounds and final admission, CAT is given 20% weightage.