To be eligible to give CAT through which you can get admission in IIM's you need to score minimum 50% in your graduation that is Bcom.
Also aim to score above 90's in your graduation because in most of the IIM's past academic scores are considered and weight age is being given.

So after you are in your final year you can apply for CAT and various other management entrances.
You can check the eligibility for CAT in the link below:

CAT Eligibility

Focus hard on your preparation and attempt previous year sample papers for idea of how the actual paper can be like.
All the best.

Good Luck.

Common Admission Test

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