Zero profile to FMS Delhi: Is it possible in 1 year?

My profile: 10th – 70%, 12th – 77%, BA – 69%, MA – 70%, 2 year gap (Arts background, Hindi medium).

I currently have no internships, certifications, or work experience. I am starting from zero and preparing for CAT with a target of top colleges like FMS Delhi.

My goal is to build a strong profile in the next 10–12 months focused on Marketing.

Questions:
1. What are my realistic chances for FMS and top IIMs?
2. What exact steps should I take to improve my profile for placements?
3. How important are internships, certifications, and projects in my case?
4. What mistakes should I avoid from now?

Please give honest and practical advice.