Hello Aspirant,

I hope you are doing well.

Apply to the GIM before the application gets closed which is generally the 1st week of January with the Cmat roll number. Once, the results come out you can update your percentile. If you get shortlisted, you will be called for GD/PI.

CMAT cut off is around 93 percentile, although many websites write above 99 percentile, but they give a call for an interview on 93  percentile.

All the best.