Filled wrong 10 percentage in CAT application form

tbh no idea the correction window opens on 5th oct but i guess during that time also you cannot change your class 10th 12th and grad marks as they are locked. maybe you can try contacting the cat helpline :
Official Contact Channels
• Toll-Free Phone Number: 1800 210 0175 (Available Monday to Saturday, 9:00 AM to 6:00 PM IST).
• General Support Email: cathelpdesk@iimcat.ac.in.
• Eligibility & Academic Query Support Email: cat2026_helpdesk@iimidr.ac.in (Managed by the CAT Centre at IIM Indore; available Monday to Friday, 9:30 AM to 5:30 PM IST).
• Web Support: You can raise a tracked support ticket through the Grievance Portal directly within your dashboard via the CAT 2026 Official Portal Login Page.

dont panic. this happens a lot and its not a dealbreaker. iims verify your 10th percentage from your original marksheet at the interview stage, so what you filled in the form doesnt directly go into the profile scoring. the marksheet is the final proof, they will use the correct percentage as per iim norms.

if you get called for interviews, just carry your original marksheet and be ready to explain calmly that you filled what was printed on it. no one will hold this against you. focus on your cat score now, thats what actually matters. dont get demotivated!